Definition of tick-tock noun from the Oxford Advanced Learner's Dictionary

 

tick-tock

 noun
noun
BrE BrE//ˌtɪk ˈtɒk//
 
; NAmE NAmE//ˌtɪk ˈtɑːk//
 
[usually singular]
 
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used to describe the sound of a large clock ticking More Like This Onomatopoeic words beep, bleep, boohoo, brrr, buzz, click, clip-clop, ding-dong, hiss, mwah, peep, ping, plop, pop, rat-tat, splat, splosh, squeak, squeal, squelch, swish, tee-hee, thud, thwack, tick-tock, toot, vroom, wham, whoosh, zoomSee worksheet. Word Origin mid 19th cent.: imitative; compare with the verb tick.
See the Oxford Advanced American Dictionary entry: tick-tock