I. flex 1 /fleks/ BrE AmE verb [transitive]
[ Date: 1500-1600 ; Language: Latin ; Origin: flexus ; ⇨ ↑ flexible ]
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.
II. flex 2 BrE AmE noun [countable] British English
[ Date: 1900-2000 ; Origin: flexible ]
an electrical wire covered with plastic, used to connect electrical equipment to an electricity supply SYN cord American English ⇨ lead