flex

1 [fleks]
verb (used with object)
1.
to bend, as a part of the body: He flexed his arms to show off his muscles.
2.
to tighten (a muscle) by contraction.
verb (used without object)
3.
to bend.
noun
4.
the act of flexing.
5.
British.
a.
any flexible, insulated electric cord; an electric cord or extension cord.
b.
Slang. an elastic band, as a garter.
6.
Mathematics. an inflection point.

Origin:
1515–25; (adj.) < Latin flexus, past participle of flectere to bend, turn; (noun) < Latin flexus act of bending, equivalent to flect(ere) + -tus suffix of v. action

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World English Dictionary
flex (flɛks)
 
n
1.  (Brit) US and Canadian name: cord a flexible insulated electric cable, used esp to connect appliances to mains
2.  informal flexibility or pliability
 
vb
3.  to bend or be bent: he flexed his arm; his arm flexed
4.  to contract (a muscle) or (of a muscle) to contract
5.  (intr) to work according to flexitime
6.  to test or display (one's authority or strength)
 
[C16: from Latin flexus bent, winding, from flectere to bend, bow]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

flex
1520s, probably a back formation from flexibility. Related: Flexed; flexing.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

flex (flěks)
v. flexed, flex·ing, flex·es

  1. To bend.

  2. To contract a muscle.

  3. To move a joint so that the parts it connects approach each other.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for flexes
The deltoid flexes the shoulder joint, and will load the shoulder if overdeveloped.
The digital flexor flexes the toe and knee and extends the elbow.
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