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1. To escape, leave, or disappear quietly or in secret. I felt really uncomfortable in the group of strangers, so I slipped away when everyone was distracted. In the commotion, the suspect slipped away from the custody of police.
2. To narrowly evade capture. We had the thief on the run, but he managed to slip away.
1. and slip off to go away or escape quietly or in secret; to slip out. I slipped away when no one was looking. Let's slip off somewhere and have a little talk. I'll try to slip out for an hour or two when Tom is asleep.
2. Euph. to die. Uncle Charles slipped away in his sleep last night.
To escape, as from a grasp, fastening, or restraint: When no one was looking, the thief quietly slipped away. The suspect slipped away from the police.