Meaning of TROUGH in English

TROUGH

n.1 a long narrow open receptacle for water, animal feed, etc.

2 a channel for conveying a liquid.

3 an elongated region of low barometric pressure.

4 a hollow between two wave crests.

5 the time of lowest economic performance etc.

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

7 a low point or depression.

Etymology: OE trog f. Gmc

Oxford English vocab.      Оксфордский английский словарь.