flex
verbUK /fleks/
US /fleks/
To bend something, like your arm or a rubber band.
He likes to flex his muscles in the mirror.
OTHER MEANINGS
2. To show off something you are proud of.
She likes to flex her new sneakers at school.
3. A bendy wire used to carry electricity.
The lamp has a long black flex.
4. To make a muscle tight and hard.
The cat flexed its claws before jumping.