slipping out
phrasal verbUK /ˈslɪpɪŋ aʊt/
US /ˈslɪpɪŋ aʊt/
Going out of a place quietly so nobody notices.
The cat was slipping out the door when I saw her.
OTHER MEANINGS
2. Coming out of your mouth without meaning to.
A little giggle was slipping out before he could stop it.
3. Being said by accident, like a secret.
The surprise was slipping out before the party even started.
4. Falling out of a place where it was held.
The pencil kept slipping out of my hand.