Meaning

verb turn sharply; change direction abruptly

verb cause to sheer

adjective complete and without restriction or qualification; sometimes used informally as intensifiers

originFrom Middle English shere, scheere, schere, skere, from Old English sċǣre (“pure, sheer; shining, clear”), from Proto-Germanic *skairiz; supplanted the semantically close shire (dialectal), from Middle English schyre, schire, shire, shir, from Old English sċīr (“clear, bright; brilliant, gleaming, shining, splendid, resplendent; pure”), beside which existed Middle English skyr, from Old Norse…

Etymology from Wiktionary, CC BY-SA 3.0