add, adjoin, annex, subjoin, tack (on)

affix, attach, fasten, fix, graft, hitch, tag, tieinfuse, inject, insert, interfuse, introduceaggrandize, amplify, augment, beef (up), boost, compound, enlarge, escalate, expand, extend, increase, multiply, raise, swell (up)elongate, lengthen, prolong, protractenhance, heighten, intensify, magnifycomplement, supplement, supplyenforce, reinforce(also reenforce), strengthenmaximize

abate, bate, deduct, knock off, remove, subtract, take off

detach, disconnect, disjoin, separate, unfastenamputate, cut, excise, lop (off), severcontract, decrease, diminish, lessen, lower, reduceabbreviate, abridge, curtail, shortencompress, condense, constrict, cut back, retrench