in deep


adjective, deeper, deepest.
extending far down from the top or surface: a deep well; a deep valley.
extending far in or back from the front or from an edge, surface, opening, etc., considered as the front: a deep shelf.
extending far in width; broad: deep lace; a deep border.
ranging far from the earth and sun: a deep space probe.
having a specified dimension in depth: a tank 8 feet deep.
covered or immersed to a specified depth (often used in combination): standing knee-deep in water.
having a specified width or number of items from front to back (often used in combination): shelves that are 10 inches deep; cars lined up at the entrance gates three-deep.
extending or cutting far down relative to the surface of a given object: The knife made a deep scar in the table.
situated far down, in, or back: deep below the surface; deep in the woods.
reaching or advancing far down: a deep dive.
coming from far down: a deep breath.
made with the body bent or lowered to a considerable degree: a deep bow.
immersed or submerged in or heavily covered with (followed by in ): a road deep in mud.
difficult to penetrate or understand; abstruse: a deep allegory.
not superficial; profound: deep thoughts.
grave or serious: deep disgrace.
heartfelt; sincere: deep affections.
absorbing; engrossing: deep study.
great in measure; intense; extreme: deep sorrow.
sound and heavy; profound: deep sleep.
(of colors) dark and vivid: a deep red.
low in pitch, as sound, a voice, or the like: deep, sonorous tones.
having penetrating intellectual powers: a deep scholar.
profoundly cunning or artful: a deep and crafty scheme.
mysterious; obscure: deep, dark secrets.
immersed or involved; enveloped: a man deep in debt.
absorbed; engrossed: deep in thought.
Baseball. relatively far from home plate: He hit the ball into deep center field.
Linguistics. belonging to an early stage in the transformational derivation of a sentence; belonging to the deep structure.
the deep part of a body of water, especially an area of the ocean floor having a depth greater than 18,000 feet (5400 meters).
a vast extent, as of space or time.
the part of greatest intensity, as of winter.
Nautical. any of the unmarked levels, one fathom apart, on a deep-sea lead line. Compare mark1 ( def 20 ).
the deep, Chiefly Literary. the sea or ocean: He was laid to rest in the deep.
adverb, deeper, deepest.
to or at a considerable or specified depth: The boat rode deep in the water.
far on in time: He claimed he could see deep into the future.
profoundly; intensely.
Baseball. at or to a deep place or position: The outfielders played deep, knowing the batter's reputation as a slugger.
go off the deep end,
to enter upon a course of action with heedless or irresponsible indifference to consequences.
to become emotionally overwrought.
in deep,
inextricably involved.
having made or committed oneself to make a large financial investment.
in deep water,
in difficult or serious circumstances; in trouble.
in a situation beyond the range of one's capability or skill: You're a good student, but you'll be in deep water in medical school.

before 900; Middle English dep, Old English dēop; akin to Gothic diups, Old Norse djupr, Old High German tiof

deepness, noun
nondeep, adjective
overdeep, adjective
undeep, adjective
undeeply, adverb

14. recondite, mysterious, obscure, profound. 23. sagacious, wise, profound, shrewd.

1, 10, 15–17, 23. shallow. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deep (diːp)
adj (foll by in)
1.  extending or situated relatively far down from a surface: a deep pool
2.  extending or situated relatively far inwards, backwards, or sideways: a deep border of trees
3.  cricket relatively far from the pitch: the deep field; deep third man
4.  a.  (postpositive) of a specified dimension downwards, inwards, or backwards: six feet deep
 b.  (in combination): a six-foot-deep trench
5.  coming from or penetrating to a great depth: a deep breath
6.  difficult to understand or penetrate; abstruse
7.  learned or intellectually demanding: a deep discussion
8.  of great intensity; extreme: deep happiness; deep trouble
9.  absorbed or enveloped (by); engrossed or immersed (in): deep in study; deep in debt
10.  very cunning or crafty; devious: a deep plot
11.  mysterious or obscure: a deep secret
12.  (of a colour) having an intense or dark hue
13.  low in pitch or tone: a deep voice
14.  informal go off the deep end
 a.  to lose one's temper; react angrily
 b.  chiefly (US) to act rashly
15.  in deep water in a tricky position or in trouble
16.  throw someone in at the deep end See end
17.  any deep place on land or under water, esp below 6000 metres (3000 fathoms)
18.  the deep
 a.  a poetic term for the ocean
 b.  cricket the area of the field relatively far from the pitch
19.  the most profound, intense, or central part: the deep of winter
20.  a vast extent, as of space or time
21.  nautical one of the intervals on a sounding lead, one fathom apart
22.  far on in time; late: they worked deep into the night
23.  profoundly or intensely
24.  informal deep down in reality, esp as opposed to appearance: she is a very kind person deep down
25.  deep in the past long ago
[Old English dēop; related to Old High German tiof deep, Old Norse djupr]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. deop, from P.Gmc. *deupaz, from PIE *d(e)u- "deep, hollow" (cf. O.C.S. duno "bottom, foundation," O.Ir. domun "world," via sense development from "bottom" to "foundation" to "earth" to "world"). Figurative sense was in O.E.; extended 16c. to color, sound. Deep pocket "wealth" is from 1951. Deep-freeze
was a registered trademark (U.S. Patent Office, 1941) of a type of refrigerator; used generically for "cold storage" since 1949. To go off the deep end "lose control of oneself" is slang first recorded 1921, probably in reference to the deep end of a swimming pool, where a person on the surface can no longer touch bottom. When 3-D films seemed destined to be the next wave and the biggest thing to hit cinema since "talkies," they were known as deepies (1953). The gods have spared us.
Online Etymology Dictionary, © 2010 Douglas Harper
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Bible Dictionary

Deep definition

used to denote (1) the grave or the abyss (Rom. 10:7; Luke 8:31); (2) the deepest part of the sea (Ps. 69:15); (3) the chaos mentioned in Gen. 1:2; (4) the bottomless pit, hell (Rev. 9:1, 2; 11:7; 20:13).

Easton's 1897 Bible Dictionary
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American Heritage
Idioms & Phrases

in deep

  1. Seriously involved; far advanced. For example, He was in deep with the other merchants and couldn't strike out on his own, or She used her credit cards for everything, and before long she was in deep.

  2. in deep water. Also, in over one's head. In trouble, with more difficulties than one can manage, as in The business was in deep water after the president resigned, or I'm afraid Bill got in over his head. These metaphoric expressions transfer the difficulties of being submerged to other problems. The first appears in Miles Coverdale's 1535 translation of the Book of Psalms (68:13): "I am come into deep waters." The second, which also can signify being involved with more than one can understand, dates from the 1600s. Also see over one's head.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Idioms & Phrases
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