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

1.
鞭策, 嚴加管教
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.
新經理不得不鞭策團隊以趕上截止日期。
•
If you don't start working harder, I'll have to crack the whip.
如果你不開始更努力地工作,我就不得不鞭策你了。