Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: flexus; FLEXIBLE

flex

1 verb
     
flex1 [transitive]
1 to tighten your muscles or bend part of your body
2

flex your muscles

to show your ability to do something, especially your skill or power:
The role will allow her to flex her acting muscles.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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