to bend, as a part of the body

He flexed his arms to show off his muscles.

to tighten (a muscle) by contraction.

to bend.

the act of flexing.

British .

any flexible, insulated electric cord; an electric cord or extension cord.

Slang . an elastic band, as a garter.

Mathematics . an inflection point.

verb

be stiff , extend , straighten

verb

angle , contract , crook , curve , lean , mold , ply , spring , stretch , tighten , tilt , yield , bend , tense