plunging (?.)
- Brownian movement
- abrupt
- abysmal
- abyssal
- advance
- angular motion
- ascending
- ascent
- axial
- axial motion
- back
- back-flowing
- backflowing
- backing
- backward
- backward motion
- bluff
- bold
- bottomless
- breakneck
- career
- cavernous
- climbing
- collapsing
- course
- current
- deciduous
- declining
- declivitous
- decurrent
- deep as hell
- deep-sea diving
- descendant
- descending
- descent
- diving
- down
- down-reaching
- down-trending
- downcoming
- downfalling
- downgoing
- downhill
- downsinking
- downward
- downward motion
- drift
- driftage
- drifting
- drooping
- dropping
- ebbing
- falling
- fancy diving
- fathomless
- flight
- flow
- flowing
- fluent
- flux
- flying
- forward motion
- gaping
- going
- gyrational
- gyratory
- headlong
- high diving
- mounting
- oblique motion
- on the descendant
- on the downgrade
- ongoing
- onrush
- orthodiagonal
- orthogonal
- passage
- passing
- pearl diving
- perpendicular
- plumb
- plumbless
- plummeting
- precipitous
- progress
- progressive
- radial motion
- random motion
- rapid
- reflowing
- refluence
- refluent
- reflux
- regression
- regressive
- retrogression
- retrogressive
- right-angle
- right-angled
- right-angular
- rising
- rotary
- rotational
- rotatory
- run
- running
- rush
- rushing
- sagging
- set
- setting
- sharp
- sheer
- sideward
- sideward motion
- sinking
- skin diving
- sky diving
- soaring
- soundless
- steep
- sternway
- straight-up
- straight-up-and-down
- stream
- streaming
- submerging
- subsiding
- tottering
- traject
- trajet
- trend
- tumbledown
- unfathomable
- unfathomed
- unsounded
- up-and-down
- up-trending
- upward
- upward motion
- vertical
- without bottom
- yawning
