a long, narrow, open receptacle, usually boxlike in shape, used chiefly to hold water or food for animals.

any of several similarly shaped receptacles used for various commercial or household purposes.

a channel or conduit for conveying water, as a gutter under the eaves of a building for carrying away rain water.

any long depression or hollow, as between two ridges or waves.

Oceanography . a long, wide, and deep depression in the ocean floor having gently sloping sides, wider and shallower than a trench. Compare trench ( def. 4 ) .

Meteorology . an elongated area of relatively low pressure.

the lowest point, esp. in an economic cycle.

noun

canal , channel , crib , cup , dike , dip , ditch , duct , flume , furrow , gully , hollow , manger , moat , trench , watercourse , basin , chute , conduit , gutter , sluice