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

1.
causar um alvoroço, criar confusão
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.
Os seus comentários controversos realmente causaram um alvoroço na reunião.
•
Announcing the new policy will certainly set the cat among the pigeons.
Anunciar a nova política certamente causará um alvoroço.