/ gluːm; NAmE / noun
1.
[ U , sing. ] a feeling of being sad and without hope
SYN depression :
The gloom deepened as the election results came in.
2.
[ U ] ( literary ) almost total darkness :
We watched the boats come back in the gathering gloom.
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IDIOMS
see doom noun , pile verb
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WORD ORIGIN
late Middle English (as a verb): of unknown origin.