flex one's muscles

Verb

 * 1)  To tense and bend one's flexor muscles.
 * 2)  To show off one's strength or skills.

Translations

 * Chinese:
 * Mandarin: 秀肌肉
 * Finnish: ,
 * Polish:
 * Russian: напряга́ть му́скулы, изгиба́ть мы́шцы


 * Finnish:
 * German: Muskeln spielen lassen
 * Polish:
 * Russian:, демонстри́ровать си́лу