trough Definition

1. A long narrow open container that animal feed or water is put into.
2. A channel, drain or gutter.

Thesaurus: channel, gully, ditch, trench, conduit, furrow, gutter, hollow.
3. A long narrow hollow between the crests of two waves.
4. meteorol.
A long narrow area of low atmospheric pressure. Compare ridge 5.
5. A low point in an economic recession.
6. Any low point.