What is "outthrusting"

Usage examples of "outthrusting".

It was fed by the waterfalls, ranging from rivulet to stream-size, which wandered down the walls like stragglers late to a meeting, Droughtsea looked appropriately sinister, his face lengthened and shadowed by the upslanting light, so that the outthrusting shelf of his brow veiled his eyes, except for an occasional flash of reflected light.