flex

1. To bend something. (transitive) · The board flexes as you step on it.
2. To repeatedly bend one of one's joints. (transitive)
3. To move part of the body using one's muscles. (transitive)
4. To tighten the muscles for display of size or strength. (intransitive)
5. To boast or brag about; to flaunt (something). (slang, transitive)
6. To flaunt one's superiority; to show off. (intransitive, slang)

He/she/it flexes · الماضي flexed · التصريف الثالث (اسم المفعول) flexed · صيغة -ing flexing