See abate in Webster's New World Roget's A-Z Thesaurus II
verb
To grow or cause to grow gradually less:
decrease, diminish, drain, dwindle, ebb, lessen, let up, peter (out), rebate, reduce, tail away (or off), taper (off). See increaseTo become or cause to become less active or intense:
bate, die (away, down, off, or out), ease (off or up), ebb, fall, fall off, lapse, let up, moderate, remit, slacken, slack off, subside, wane. See increaseTo take away (a quantity) from another quantity:
deduct, discount, rebate, subtract, take (off). (Informal) knock off. See increase
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