American English

Definition of flex verb from the Oxford Advanced American Dictionary

 

flex

 verb
verb
NAmE//flɛks//
 
[transitive, intransitive] flex (something)Verb Forms present simple I / you / we / they flex
 
he / she / it flexes
 
past simple flexed
 
-ing form flexing
 
 
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  • to bend, move, or stretch an arm or a leg, or contract a muscle, especially in order to prepare for a physical activity to flex your fingers/feet/legs He stood on the side of the pool flexing his muscles.
  • Idioms
    flex your muscles
     
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    to show someone how powerful you are, especially as a warning or threat