n.
Pronunciation: ' fleks
Function: verb
Etymology: Latin flexus, past participle of flectere to bend
Date: circa 1521
transitive verb
1 : to bend especially repeatedly
2 a : to move muscles so as to cause flexion of (a joint) b : to move or tense (a muscle) by contraction
3 : USE , DEMONSTRATE < flex ing her skills as a singer>
intransitive verb : BEND
– flex one's muscles : to demonstrate one's strength <an exaggerated need to flex his political muscles ― J. P. Lash>