flex your muscles
US /flɛks jʊər ˈmʌslz/
UK /flɛks jʊər ˈmʌslz/

1.
mostrar su poder, demostrar su fuerza
to show off your power, strength, or influence
:
•
The company decided to flex its muscles by launching a new, aggressive marketing campaign.
La empresa decidió mostrar su poder lanzando una nueva y agresiva campaña de marketing.
•
The politician tried to flex his muscles during the debate, but his arguments were weak.
El político intentó mostrar su poder durante el debate, pero sus argumentos eran débiles.