A feeling or spell of dismally low spirits
To make dim or indistinct
The news of his death cast a gloom over the whole empire.
His gloom had been increased by domestic misfortune.
The gloom was terrible.
It was no longer, as before, a dark, unseen river flowing through the gloom, but a dark sea swelling and gradually subsiding after a storm.
He now made up his mind to study the real wilderness in its gloom and vastness, and to meet face to face the dusky warriors of the Stone Age.