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

1.
mostrar sua força, demonstrar poder
to show off your power, strength, or influence
:
•
The company decided to flex its muscles by launching a new, aggressive marketing campaign.
A empresa decidiu mostrar sua força lançando uma nova e agressiva campanha de marketing.
•
The politician tried to flex his muscles during the debate, but his arguments were weak.
O político tentou mostrar sua força durante o debate, mas seus argumentos eram fracos.