Meaning

noun showing your contempt by derision

verb laugh at with contempt and derision

originFrom earlier gyr, probably from Dutch gieren (“to roar with laughter, laugh loudly”) (related to German gieren (“to gape, snap”)); or from Dutch gekscheren (“to jeer”, literally “to shear the fool”), from gek (“a fool”) (see geck) + scheren (“to shear”) (see shear (verb)). The OED states no verifiable connection to English cheer.

Etymology from Wiktionary, CC BY-SA 3.0