The ticking of the clock kept her awake.
Tick n. 对勾
Put a tick by the names of the people who have accepted the invitation.
What makes sb. tick
Janet is a very private person, so it's hard to know what makes her tick.
tick away 一点一点过去
I hated that class. Everyday I just sat in my chair watching the minutes tick away on the clock.
The clock is ticking. 时间所剩不多
The clock is ticking, so be sure to complete your exams.