abate, abrade, abstract, bate, bite, canker, corrode, curtail, decrease, deduct, depreciate, derogate, detract, diminish, disparage, drain, eat, eat into, erode, extract, file away, gnaw, impair, leach, lessen, nibble away, oxidize, purify, reduce, refine, remove, retrench, rub away, rust, scour, shorten, subduct, subtract, take away, take from, thin, thin out, wear away, weed, withdraw