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Related topics:1 [countable]DTM a small clock that you wear on your wrist or keep in your pocket :
2 [singular, uncountable] when you watch someone or something carefully, or pay careful attention to them, so that you are ready to act if necessary
3 to be looking and waiting for something that might happen or someone you might see, especially so that you can avoid danger, trouble etc : 
Be on the watch for anything suspicious.
keep a watch out for somebody/something
also be on the watch for somebody/somethingBe on the watch for anything suspicious.4 [countable] a group of people whose job is to guard or protect someone or something : We were arrested and held until the arrival of the night watch (=people responsible for keeping the streets safe at night, especially in past times). ➔ neighbourhood watch
We were arrested and held until the arrival of the night watch (=people responsible for keeping the streets safe at night, especially in past times).5 [uncountable and countable] a period of time when it is someone's duty to stay somewhere and look for signs of danger : The first watch is from now until midnight.
The first watch is from now until midnight.