coldness, especially a moderate but uncomfortably penetrating coldness: the chill of evening.
a sensation of cold, usually with shivering: She felt a slight chill from the open window.
a feeling of sudden fear, anxiety, or alarm.
sudden coldness of the body, as during the cold stage of an ague: fevers and chills.
a depressing influence or sensation: His presence cast a chill over everyone.
lack of warmth of feeling; unfriendliness; coolness.
Foundry. an inserted object or a surface in a mold capable of absorbing large amounts of heat, used to harden the surface of a casting or to increase its rate of solidification at a specific point.
bloom1 ( def 12 ).
moderately cold; tending to cause shivering; chilly: a chill wind.
shivering with or affected by cold; chilly.
depressing or discouraging: chill prospects.
Slang. cool ( def 14 ).
unduly formal; unfriendly; chilly: a chill reception.
verb (used without object)
to become cold: The earth chills when the sun sets.
to be seized with a chill; shiver with cold or fear.
Foundry. (of a casting) to become hard on the surface by contact with a chill or chills.
verb (used with object)
to affect with cold; make chilly: The rain has chilled me to the bone.
to make cool: Chill the wine before serving.
to depress; discourage; deter: The news chilled his hopes.
Foundry. to harden the surface of (a casting) by casting it in a mold having a chill or chills.
bloom1 ( def 22 ).
Slang. to kill; murder.
Verb phrases
chill out, Slang. to calm down; relax. Also, chill.
Take a chill pill!, Disparaging Slang. chill pill ( def 2 ).

before 900; Middle English chile, Old English ci(e)le, cele coolness; akin to gelid, cool, cold

chillingly, adverb
chillness, noun
overchill, adjective
overchill, verb
prechill, verb (used with object)
unchilled, adjective
well-chilled, adjective

9. See cold. 13. cold, aloof, hostile, stiff. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chill (tʃɪl)
1.  a moderate coldness
2.  a sensation of coldness resulting from a cold or damp environment, or from a sudden emotional reaction
3.  a feverish cold
4.  a check on enthusiasm or joy
5.  a metal plate placed in a sand mould to accelerate cooling and control local grain growth
6.  another name for bloom
7.  another word for chilly
8.  to make or become cold
9.  (tr) to cool or freeze (food, drinks, etc)
10.  (tr)
 a.  to depress (enthusiasm, etc)
 b.  to discourage
11.  (tr) to cool (a casting or metal object) rapidly in order to prevent the formation of large grains in the metal
12.  slang chiefly (US) (intr) to relax; calm oneself
[Old English ciele; related to calan to cool, Latin gelidus icy]

chill out
1.  (intr, adverb) to relax, esp after energetic dancing or a spell of hard work
2.  suitable for relaxation after energetic dancing or hard work: a chill-out area; chill-out music

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. ciele, cele "cold," from P.Gmc. *kal- "to be cold," from PIE base *gel- "cold." The verb (both lit. and figurative) is 14c., from the noun. Meaning "hang out" first recorded 1985; from earlier (1979) sense of chill out "relax."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

chill (chĭl)
A feeling of cold, with shivering and pallor, sometimes accompanied by an elevation of temperature in the interior of the body.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary

chill out definition

To not get so excited; to take it easy: “Hey, chill out, we'll get there sooner or later.” This phrase can also mean to relax; to have a good time: “On my vacation I just want to chill out on the beach with a good book.” It is often shortened to the imperative chill: “Chill! We can do without your bad behavior.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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American Heritage
Idioms & Phrases

chill out

Calm down or relax, as in Don't let it bother youjust chill out, or Rex decided to come home and chill out for a while. [Slang; 1970s.] Also see cool it.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Once thing that is certain is that the winds will go calm tonight, thus taking
  wind chill out of the equation.
Her message was that everyone involved in admissions needed to chill out for
  the sake of education, not to mention their sanity.
Juke decides that everyone should chill out-he'll play the jukebox, they'll all
  get down.
Couples may enjoy its hot tubs, or they may opt to chill out with a romantic
  comedy at the on-site, first run movie theater.
Idioms & Phrases
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