put/set the cat among the pigeons
US /pʊt/sɛt ðə kæt əˈmʌŋ ðə ˈpɪdʒɪnz/
UK /pʊt/sɛt ðə kæt əˈmʌŋ ðə ˈpɪdʒɪnz/

1.
引起轩然大波, 惹麻烦
to say or do something that causes trouble or makes a lot of people angry or worried
:
•
His controversial remarks really put the cat among the pigeons at the meeting.
他那些有争议的言论真是在会议上引起了轩然大波。
•
Announcing the new policy will certainly set the cat among the pigeons.
宣布这项新政策肯定会引起轩然大波。