Meaning

noun a facial expression of contempt or scorn; the upper lip curls

noun a contemptuous or scornful remark

verb express through a scornful smile

originFrom Middle English sneren (“to mock, scoff at”), from Old English fnǣran (“to snort”), from Proto-West Germanic *fnāʀijan, from Proto-Germanic *fnesaną (“to pant, gasp”). Akin to North Frisian sneere (“to scorn”), Middle High German snerren (“to chatter; gossip”), Danish snerre (“to growl, snarl”).

Etymology from Wiktionary, CC BY-SA 3.0