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A nautical term for looking after everything else on the boat whilst the other "watch" are sailing it.

Includes: cooking, cleaning the deck(s), cleaning the bilge(s), cleaning the head(s) otherwise known as the toilets, general boat maintenance and sleep.
Steve: "Is Johno sailing the boat today?"

Bernie: "No, he's on Mother Watch Duties"
by Vshjaar March 06, 2010
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