watchwatch2 ●●● noun 1 [countable] a small clock that you wear on your wrist or carry in your pocket: Scott looked at his watch.2[singular, uncountable] the process of checking a situation or a place carefully so that you always know what is happening and are ready to deal with it: Police kept a 24-hour watch on the house. Several soldiers stood watch. Douglas kept watch while the others slept.3be on the watch for somebody/something to be looking and waiting for someone you might see or something that might happen: Be on the watch for pickpockets.4[countable, uncountable] people employed to guard or protect someone or something, or the fixed period of the day or night when they do this: the night watch It was my turn to be on watch.