drop (off)

abate, de-escalate, decline, decrease, die (away or down or out), diminish, drain (away), dwindle, ease, ebb, fall, fall away, lessen, let up, lower, moderate, pall, phase down, ratchet (down) also rachet (down) , recede, relent, remit, shrink, subside, taper, taper off, wane

abatement, decline, decrease, decrement, dent, depletion, depression, diminishment, diminution, drop, fall, falloff, loss, reduction, shrinkage, step-down