dumps
Concise Oxford English Dictionary © 2008 Oxford University Press:
dumps/dʌmps/
▶plural noun (in phr. (down) in the dumps) informal depressed or unhappy.
– origin C16 (orig. sing. in the sense ‘a dazed or puzzled state’): prob. a figurative use of MDu. domp ‘haze, mist’.
'dumps' also found in these Oxford entries:

