defenestrate, get rid of, remove, destroy, sheathe, blot out, black out, obliterate, bury, obviate, preclude, render unnecessary, douse, extinguish, blacken, erase, purge, eradicate, annihilate, eliminate, abolish, expunge (from a record), stamp out, beat back, snuff out, put out (of one's mind), stub out, wipe out/from, white out, strike (out), put out (a fire/a life), cover one's tracks, exterminate
chip away, slash, shave off, trim, flatten, contract, abrade, shed, whittle, chisel, lower, shrink, thin, reduce, narrow, divide, deduct, consume, apportion, skimp, scale back/down, economize, hemorrhage (money/staff), shorten, minimize, lessen, dwarf, prune, pare (down), diminish, cut (back/down), cut costs, slim down (the budget), abridge, stunt, truncate, take away, compact, restrict (growth), ratchet down, subtract, subdivide, miniaturize, foreshorten, rightsize
hollow out, squash, quash, thin, water down, beat down, weaken, endanger, jeopardize, encumber, impair, undermine, sap, suck out, incapacitate, exhaust, erode, blunt, drain (of vitality), enervate, starve, grind down, tax (one's reserves), hit someone hard, wind (one from exertion), tire someone out, debilitate, fatigue, wear out/down, devitalize, eat away, chip away at, weary, defang