What is "mouth hole"

Usage examples of "mouth hole".

And then a hinged jaw dropped open and the muzzle of a gun appeared from his mouth hole.

The thorn-helm crumpled inward, and the man fell to his knees, vomit spewing from his mouth hole.

A tin whistle had a feather sticking out of its mouth hole and what appeared to be a dried rat’.

When his own plate was clean, and Hotspur's bottomless serving dishes empty, the otherwise gracious yet dictatorial host felt free to sample off the leavings of his guests' plates, much to the great relief of Chesslyn and Volo who found themselves full before the midpoint of the meal, and Rassendyll, whose progress was greatly inhibited by his turban-bound visage and the size of the mouth hole in the mask.

Atkins' voice said, the mouth hole in his hood puffing with his breath.