(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)dunk, dip, souse, plunge, douseimmerse briefly into a liquid so as to wet, coat, or saturate“dip the garment into the cleaning solution”, “dip the brush into the paint”