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Trough has several meanings

1.a long, narrow open container for animals to eat or drink out of.

eg The pig ate from the trough.

2.a channel used to convey a liquid.

eg The heavy rain made a trough in the hillside.

3.an elongated region of low barometric pressure.

eg A trough of low pressure will move onto the country over night.

4.a hollow between two wave crests in the sea.

eg The life boat was in a trough between two waves.

5.a region around the minimum on a curve of variation of a quantity.

eg The graph showed several peaks and troughs of activity.

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13y ago

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