Slip awayphrasal verbTo quietly leave a place without being noticed.I slipped away early so I could catch the last train home. Often appears as...slip away quietly slip away unnoticed Usage tipsColloquial Definition 1 of 3Pro Tip 1/2Silent Exit Used when someone leaves discreetly without drawing attention. During the party, I managed to slip away to get some rest. Pro Tip 2/2Quick Movement Often suggests leaving swiftly and smoothly, like slipping through fingers. He slipped away from the group to explore alone.