tictac

noun [具体名词]滴答声；跳动声

A "tic-tac" can also be a simple device, often involving a string and a weight, used to tap on windows or doors to prank someone.
“嗒嗒声”也可以指一种简单的装置，通常由一根绳子和一个重物组成，用于敲击窗户或门来戏弄他人。