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flex

1 flex /ˈflɛks/ verb
flexes; flexed; flexing
1 flex
/ˈflɛks/
verb
flexes; flexed; flexing
Britannica Dictionary definition of FLEX
[+ object]
: to bend (a body part)
: to move or tighten (a muscle)

flex your muscles

: to show your strength or power
2 flex /ˈflɛks/ noun
plural flexes
2 flex
/ˈflɛks/
noun
plural flexes
Britannica Dictionary definition of FLEX
[count] British