[prep. in-sahyd, in-sahyd; adv. in-sahyd; n. in-sahyd; adj. in-sahyd, in-, in-sahyd]
on the inner side or part of; within: inside the circle; inside the envelope.
prior to the elapse of; within: He promised to arrive inside an hour.
in or into the inner part: Please go inside.
indoors: They play inside on rainy days.
within one's heart, reason, etc.; by true nature; basically: I know inside that he's not guilty. Inside, she's really very shy.
Slang. in prison.
the inner or internal part; interior: the inside of the house.
the inner side or surface: the inside of the hand; He pinned the money to the inside of his jacket.
Usually, insides. Informal. the inner parts of the body, especially the stomach and intestines: The coffee scalded my insides.
a select or inner circle of power, prestige, etc.: a man on the inside.
the shortest of several parallel, curving tracks or lanes; the part of an oval track closest to the inner rail: The horse came up fast on the inside.
the inward nature, mind, feelings, etc.
Slang. confidential or secret information.
an inside passenger or place in a coach, carriage, etc.
situated or being on or in the inside; interior; internal: an inside seat.
acting, employed, done, or originating within a building or place: He used to work on the dock but now he has an inside job.
derived from the inner circle of those concerned in and having private knowledge of a situation: inside information.
Baseball. (of a pitched ball) passing between home plate and the batter: The pitch was low and inside.
inside of, Informal. within the space or period of: Our car broke down again inside of a mile.
inside out,
with the inner side reversed to face the outside.
thoroughly; completely: She knew the work inside out.

1350–1400; Middle English; see in, side1

7. Inside, interior both refer to the inner part or space within something. Inside is a common word, and is used with reference to things of any size, small or large: the inside of a pocket. Interior somewhat more formal, denotes the inner part or the space or regions within; it usually suggests considerable size or extent, and sometimes a richness of decoration: the interior of a country, of the earth, of a cathedral.

7. outside, exterior. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  the interior; inner or enclosed part or surface
2.  the side of a path away from the road or adjacent to a wall
3.  informal (also plural) the internal organs of the body, esp the stomach and bowels
4.  inside of in a period of time less than; within
5.  inside out with the inside facing outwards
6.  know something inside out to know something thoroughly or perfectly
7.  in or to the interior of; within or to within; on the inside of
8.  on or of an interior; on the inside: an inside door
9.  (prenominal) arranged or provided by someone within an organization or building, esp illicitly: the raid was an inside job; inside information
10.  within or to within a thing or place; indoors
11.  by nature; fundamentally: inside, he's a good chap
12.  slang in or into prison

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

1392, ynneside "interior of the body," compound of inne (adv.) + side. The adj. is 1611, from the noun. Insider in the modern sense of "one in possession of special information by virtue of being within some organization" is first recorded 1848, originally in ref. to the stock markets. Inside job "robbery,
espionage, etc., committed by or with the help of a resident or servant of a place" is attested from 1908. Inside track "advantage" is metaphoric because those lanes are shorter on a curved track. Inside-out is attested from c.1600; inside of, in ref. to time, is from 1839.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases


In addition to the idioms beginning with inside, also see on the inside; step in (inside).

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
In the rear is the cabin, its misty windows glowing wanly with the light of a
  lamp inside.
When done, the product should feel dry on the outside but should be slightly
  soft inside.
To fasten the hook on the inside they must be at home, don't you see.
Some brides prefer to remove their left glove by merely pulling it inside out
  at the altar.
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