plummeting

abating declining depreciating diminishing dropping dwindling ebbing lightening lowering moderating narrowing plunging quieting sagging shrinking sinking slackening slowing slumping softening subsiding waning wasting weakening

dying down fading away losing momentum shriveling up wearing down wearing off

plunge slide

coast crash declension declination decline declivity dip downgrade droop drop drop-off fall grade gradient header hill inclination incline landslide precipitation prolapse sag settlement sinking slant slip slope swoop tailspin tumble

cave-in coming down falling plunging sinkage topple

ascent evenness increase level rise

ascension elevation improvement upgrade

collapse decline dive drop nosedive plummet plunge sag slump

upturn