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Definition of trough:

  1. A long, hollow vessel, generally for holding water or other liquid, especially one formed by excavating a log longitudinally on one side; a long tray; also, a wooden channel for conveying water, as to a mill wheel.
  2. Any channel, receptacle, or depression, of a long and narrow shape; as, trough between two ridges, etc.
  3. The transverse section of a cyclonic area where the barometric pressure, neither rising nor falling, has reached its lowest point.

Synonyms:

roll, arena, sports stadium, hollow, hole, eavestrough, bowling ball, depression between waves, bowl, bowlful, boulder clay, sewer, manger, pipe bowl, public treasury, toilet, gutter, till, cashbox, money box, stadium, cup.

Usage examples: