Trough

noun
1.
a long, narrow, open receptacle, usually boxlike in shape, used chiefly to hold water or food for animals.
2.
any of several similarly shaped receptacles used for various commercial or household purposes.
3.
a channel or conduit for conveying water, as a gutter under the eaves of a building for carrying away rain water.
4.
any long depression or hollow, as between two ridges or waves.
5.
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).
6.
Meteorology. an elongated area of relatively low pressure.
7.
the lowest point, especially in an economic cycle.
noun
1.
a narrow open container, esp one in which food or water for animals is put
2.
a narrow channel, gutter, or gulley
3.
a narrow depression either in the land surface, ocean bed, or between two successive waves
4.
(meteorol) an elongated area of low pressure, esp an extension of a depression Compare ridge (sense 6)
5.
a single or temporary low point; depression
6.
(physics) the portion of a wave, such as a light wave, in which the amplitude lies below its average value
7.
(economics) the lowest point or most depressed stage of the trade cycle
verb
8.
(intransitive) (informal) to eat, consume, or take greedily
trough
(trôf)

The part of a wave with the least magnitude; the lowest part of a wave. Compare crest. See more at wave.

A narrow, elongated region of relatively low atmospheric pressure occurring at the ground surface or in the upper atmosphere, and often associated with a front. Compare ridge.

trots, the