The phrase "tick away" refers to the passage of time or the progression of an event. It is a synonym of "count down," "ebb," "slip by," "pass," "move on," "elapse," "proceed," "advance," "flow," and "drift away." "Tick away" is often used to describe the sound of a clock or watch, so other synonyms to use are "chime," "ring," "toll," or "tock." "Tick away" can also be associated with tension, so other synonyms may include "ticking time bomb," "ticking off," or "ticking over," depending on the context.