The grade has ever steepened, till now it is forty degrees or more.
The slope had now steepened considerably, and further conversation died out in the effort of climbing.
The side walls were steepened and precipitous cirques were formed at the valley heads.
If by chance the detritus accumulates rapidly, the slope is steepened and the work of the torrent made more efficient.
Meanwhile the sides of the valley head are steepened and driven back to precipitous walls.