drop (n.) Look up drop at Dictionary.com
O.E. dropa, from P.Gmc. drupon, from PIE *dhreub-. The verb (O.E.) originally meant "fall in drops;" trans. sense "allow to fall" is c.1340. Meaning "lozenge, hard candy" is 1723. Dim. form droplet is from 1607. Drop in the bucket (1382) is from Isa. ix.15 [K.J.V.]. Exclamation drop dead is from 1934; as an adj. meaning "stunning, excellent" it is first recorded 1970. At the drop of a hat "suddenly" is from 1854; drop-in "casual visit" is 1819; drop-kick is 1857; drop-out (n.) first attested 1930.