Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary
1

flex

play
verb \ˈfleks\

Simple Definition of flex

  • : to bend (a body part)

  • : to move or tighten (a muscle)

Full Definition of flex

  1. transitive verb
  2. 1 :  to bend especially repeatedly

  3. 2 a :  to move muscles so as to cause flexion of (a joint) b :  to move or tense (a muscle) by contraction

  4. 3 :  use, demonstrate <flexing her skills as a singer>

  5. intransitive verb
  6. :  bend

flex one's muscles
  1. :  to demonstrate one's strength <an exaggerated need to flex his political muscles — J. P. Lash>

Examples of flex

  1. He flexed the muscles of his right arm.

  2. a material that flexes easily



Origin of flex

Latin flexus, past participle of flectere to bend


First Known Use: circa 1521

Rhymes with flex

dex, ex, hex, lex, rex, sex, specs, vex, x


2

flex

noun

Definition of flex

chiefly British

  1. :  an electric cord



Origin of flex

short for flexible cord


First Known Use: 1905


3

flex

noun

Definition of flex

  1. :  an act or instance of flexing



Circa 1934

First Known Use of flex

circa 1934


Medical Dictionary

flex

play
transitive verb \ˈfleks\

Medical Definition of flex

  1. 1:  to bend especially repeatedly

  2. 2a:  to move muscles so as to cause flexion of (a joint) <stretching and flexing his knees>b:  to move or tense (a muscle or muscles) by contraction <flexed their biceps>





Learn More about flex


Seen and Heard

What made you want to look up flex? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 9, 2016

marked by high spirits and laughter

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

pince-nez duvet kittly-benders spindrift
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ