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Definition of flex verb from the Oxford Advanced Learner's Dictionary

flex

verb
 
/fleks/
 
/fleks/
[transitive, intransitive]
Verb Forms
present simple I / you / we / they flex
 
/fleks/
 
/fleks/
he / she / it flexes
 
/ˈfleksɪz/
 
/ˈfleksɪz/
past simple flexed
 
/flekst/
 
/flekst/
past participle flexed
 
/flekst/
 
/flekst/
-ing form flexing
 
/ˈfleksɪŋ/
 
/ˈfleksɪŋ/
Idioms
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  1. flex (something) to bend, move or stretch an arm or a leg, or pull a muscle tight, 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.
    Word Originverb early 16th cent.: from Latin flex- ‘bent’, from the verb flectere.
Idioms
flex your muscles
  1. to show somebody how powerful you are, especially as a warning or threat
See flex in the Oxford Advanced American Dictionary

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