slip away

verb4

1. •
   To leave without being noticed.

   • I'm going to try to slip away from work early, if I can.
2. •
   To pass quickly, almost unnoticed.

   • The months slipped away and became years.
3. •
   To disappear; to elude one; to recede; to dwindle.

   • What about love? Don't you want someone to care about you? What about love? Don't let it slip away — 1985
4. •
   (euphemistic) To die peacefully.

   • He slipped away quietly in his sleep.