- To leave a place, or a gathering, without being noticed.
- I'm going to try to slip away from work early, if I can.
- 1906, Edith Nesbit, The Railway Children, Chapter 4: The engine-burglar,
- But when Bobbie crept down later to bring up her presents--for she felt she really could not be separated from them all night--Mother was not writing, but leaning her head on her arms and her arms on the table. I think it was rather good of Bobbie to slip quietly away, saying over and over, "She doesn't want me to know she's unhappy, and I won't know; I won't know." But it made a sad end to the birthday.
- (of time) To pass quickly, almost unnoticed.
- The months slipped away and became years.
- (of an advantage) To disappear; to elude one.
- When Liverpool scored a third goal, their hopes of winning slipped away forever.
- 2010 December 28, Kevin Darling, “West Brom 1 - 3 Blackburn”, in BBC:
- Scharner then headed a Dorrans free-kick against the crossbar, with Tchoyi unable to turn in the follow-up as the Baggies saw their hopes of salvaging a point slip away.
- (euphemistic) To die peacefully.
- He slipped away quietly in his sleep.