watch and watch en · NOUN
Meanings
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(no-plural) The regular alternation in being on watch and off watch of the two watches into which a ship's crew is commonly divided.
And Mr. Pike, for practically all of his sixty-nine years, has stood his watch-and-watch, with many a spill-over of watches into watches.
1914, Jack London, The Mutiny of the Elsinore, Chapter XLIV: