cave in(n = noun.event) subsidence - the sudden collapse of something into a hollow beneath it;
is a kind of collapse
Derived form verb cave in₁

   cave in(v = verb.motion) break, collapse, fall in, founder, give, give way - break down, literally or metaphorically; "The wall collapsed"; "The business collapsed"; "The dam broke"; "The roof collapsed"; "The wall gave in"; "The roof finally gave under the weight of the ice"
is one way to change
Derived form noun cave in₁
Sample sentences: Something ----s; Somebody ----s

VB  succumb, submit, yeild, bend, resign, defer to, lay down one's arms, deliver up one's arms, lower colors, haul down colors, strike one's flag, strike colors, surrender, surrender at discretion, cede, capitulate, come to terms, retreat, beat a retreat, draw in one's horns, give way, give round, give in, give up, cave in, suffer judgment by default, bend, bend to one's yoke, bend before the storm, reel back, bend down, knuckle down, knuckle to, knuckle under, knock under, eat dirt, eat the leek, eat humble pie, bite the dust, lick the dust, be at one's feet, fall at one's feet, craven, crouch before, throw oneself at the feet of, swallow the leek, swallow the pill, kiss the rod, turn the other cheek, avaler les couleuvres, gulp down, obey, kneel to, bow to, pay homage to, cringe to, truckle to, bend the neck, bend the knee, kneel, fall on one's knees, bow submission, courtesy, curtsy, kowtow, pocket the affront, make the best of, make a virtue of necessity, grin and abide, grin and bear it, shrug the shoulders, resign oneself, submit with a good grace.

VB  be concave, retire, cave in, render concave, depress, hollow, scoop, scoop out, gouge, gouge out, dig, delve, excavate, dent, dint, mine, sap, undermine, burrow, tunnel, stave in.

VB  come short of, fall short of, stop short of, come short, fall short, stop short, not reach, want, keep within bounds, keep within the mark, keep within the compass, break down, stick in the mud, collapse, flat out, come to nothing, fall through, fall to the ground, cave in, end in smoke, miss the mark, fail, lose ground, miss stays.

cave, cave bat, cave dweller, cave man, cave myotis, fingal's cave, mammoth cave national park, wind cave national park