American English

Definition of trough noun from the Oxford Advanced American Dictionary



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  1. 1[countable] a long, narrow, open container for animals to eat or drink from
  2. 2the trough [singular] (informal) if you say that people have their noses in the trough, you mean that they are trying to get a lot of money for themselves
  3. 3[countable] (technology) a long, narrow region of low air pressure between two regions of higher pressure compare ridge
  4. 4[countable] a period of time when the level of something is low, especially a time when a business or the economy is not growing There have been peaks and troughs in the long-term trend of unemployment.
  5. 5[countable] a low area between two waves in the ocean, or two hills
See the Oxford Advanced Learner's Dictionary entry: trough