i Register
In some senses, trough is marked as colloquial. Watch for register when choosing this word.
ADJ
drinking, feeding | water | cattle, horse, pig
ADJ
deep
VERB + TROUGH
fall to, reach
The company's profits reached a trough during the recession before recovering the following year.
PHRASES
from peak to trough
Her happiness went from peak to trough when she lost her job last month.
the peaks and troughs
Life has its peaks and troughs, but we learn something valuable from each experience.