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

1.
montrer ses muscles, faire étalage de sa puissance
to show off your power, strength, or influence
:
•
The company decided to flex its muscles by launching a new, aggressive marketing campaign.
L'entreprise a décidé de montrer ses muscles en lançant une nouvelle campagne de marketing agressive.
•
The politician tried to flex his muscles during the debate, but his arguments were weak.
Le politicien a essayé de montrer ses muscles pendant le débat, mais ses arguments étaient faibles.