(n)drop, drib, dribleta small indefinite quantity (especially of a liquid)“he had a drop too much to drink”, “a drop of each sample was analyzed”, “there is not a drop of pity in that man”, “years afterward, they would pay the blood-money, driblet by driblet” (Kipling)
(n)drop, dip, fall, free falla sudden sharp decrease in some quantity“a drop of 57 points on the Dow Jones index”, “there was a drop in pressure in the pulmonary artery”, “a dip in prices”, “when that became known the price of their stock went into free fall”
(v)devolve, deteriorate, drop, degenerategrow progressively worse“Her condition deteriorated”, “Conditions in the slums degenerated”, “The discussion devolved into a shouting match”