slip out

US /slɪp aʊt/
UK /slɪp aʊt/
"slip out" picture
1.

to leave a place quietly and unnoticed

:
He tried to slip out of the meeting without anyone noticing.
The cat managed to slip out through the open door.
2.

if a remark or secret slips out, you say it accidentally

:
The secret about the surprise party almost slipped out during dinner.
A rude comment slipped out before I could stop myself.