Can you tell me what mouri poul mean please? what's the literal translation? kill chickens or kill for it? thanks

mouri poul is and expression which means to stay under the radar, to take it easy,to calm down
egzanp:
Misye mouri poul li pou l pa nan okenn lòt pwoblèm ak lalwa.
He calmed down to prevent further problems with the law.

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