crack the whip
US /kræk ðə wɪp/
UK /kræk ðə wɪp/

1.
bater o chicote, apertar as rédeas
to use your authority to make someone work harder or behave better
:
•
The new manager had to crack the whip to get the team to meet the deadline.
O novo gerente teve que bater o chicote para fazer a equipe cumprir o prazo.
•
If you don't start working harder, I'll have to crack the whip.
Se você não começar a trabalhar mais duro, terei que bater o chicote.