A long, narrow container used to hold food or water for animals. In meteorology, it refers to an elongated area of low atmospheric pressure.
From Old English 'trog', related to Old Norse 'trog' (trough, boat). The word shares roots with 'tree' and originally referred to containers carved from wood.
The meteorological meaning of trough creates some of the most dramatic weather patterns on Earth - these atmospheric valleys can spawn everything from gentle rain to severe thunderstorms. Interestingly, the word maintains its 'container' essence whether holding pig feed or storm systems.
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