steepening

v.

become steeper

"The mountain side has steepened"

make steeper

"The landslides have steepened the mountain sides"

Steepening of Afterglow Decay for Jets Interacting with Stratified Media
the supercontinuum laser source || self-steepening of optical pulses
Steepening of kinetic magnetosonic waves into shocklets: Simulations and consequences for planetary shocks and comets
Visible Harmonic Emission as a Way of Measuring Profile Steepening
Self-Modulation, Self-Steepening, and Spectral Development of Light in Small-Scale Trapped Filaments
Role of the anomalous self-steepening effect in modulation instability in negative-index material
Vector analysis of astigmatism changes by flattening, steepening, and torque.
Quaternary deformation, river steepening, and heavy precipitation at the front of the Higher Himalayan ranges
Nonlinear asymmetric self-phase modulation and self-steepening of pulses in long optical waveguides
Magma generation by slab steepening and breakoff beneath a subduction‐accretion complex: An alternative model for collision‐relate...