Whilst
来自Big Physics
Safin（讨论 | 贡献）2022年4月27日 (三) 16:49的版本 （建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=whilst+etymology&newwindow=1&hl=en ref] late Middle English: from whiles + -t as in again…”的新页面）
late Middle English: from whiles + -t as in against.
wiktionary
From whiles + -t. Surface analysis while + -st(“ excrescence”). Cognate with West Frisian wylst(“whilst”). More at whiles.
etymonline
whilst (adv.)
late 14c., from while (q.v.) with adverbial genitive -s-, and unetymological -t (see amidst).
