1flex 
/ˈflɛks/ verb
flex·es; flexed; flex·ing /ˈflɛks/ verb 1 [+ obj] a : to bend (a body part)
▪ flexing a leg ▪ flex your fingers
b : to move or tighten (a muscle)
▪ He flexed the muscles of his right arm. 2 [no obj] : bend
▪ a material that flexes easily
▪ flexing a leg ▪ flex your fingers
b : to move or tighten (a muscle)
▪ He flexed the muscles of his right arm.
▪ a material that flexes easily
flex your muscles
: to show your strength or power
▪ The election will give us a chance to flex our political muscles.
▪ The election will give us a chance to flex our political muscles.
