let someone/something be
US /lɛt ˈsʌmˌwʌn ˈsʌmˌθɪŋ bi/
UK /lɛt ˈsʌmˌwʌn ˈsʌmˌθɪŋ bi/

1.
laisser tranquille, ne pas déranger
to leave someone or something alone; to not disturb or interfere with someone or something
:
•
Just let him be; he's in a bad mood.
Laisse-le tranquille; il est de mauvaise humeur.
•
Please let the cat be; it's sleeping.
S’il te plaît, laisse le chat tranquille; il dort.