Longman Dictionary of Contemporary English homepage

Topic: NATURE

Language: Old English
Origin: trog

trough

noun
     
trough [countable]
1

container

TA a long narrow open container that holds water or food for animals:
a horse trough
2

low point

PE a short period of low activity, low prices etc [≠ peak]
trough of
The graph showed peaks and troughs of activity.
3

waves

DN the hollow area between two waves
4

weather

technicalHEM a long area of fairly low pressure between two areas of high pressure
5

have your nose/snout in the trough

British English if people have their noses in the trough, they are involved in something which they hope will get them a lot of money or political power - used to show disapproval
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