Third-person singular simple present indicative form of clock.(verb)
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Use "clocks" in a sentence
"For you know -- or will learn -- that there are clocks _and clocks_."
"Not forgetting to reset the clocks is a challenge everyone has to master, but the switch to or from daylight saving poses extra challenges for tech-laden travellers."
"Learning conversational Spanish and re-setting their "internal clocks" is more difficult."