tick-tock

noun
🔊/ˌtɪk ˈtɒk/
🔊/ˌtɪk ˈtɑːk/
[usually singular]
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  1. used to describe the sound of a large clock ticking(大时钟的)滴答声
    Word Originmid 19th cent.: imitative; compare with the verb tick.