Avail
来自Big Physics
Safin（讨论 | 贡献）2022年4月27日 (三) 16:28的版本 （建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=avail+etymology&newwindow=1&hl=en ref] Middle English: from obsolete vail ‘be of use o…”的新页面）
Middle English: from obsolete vail ‘be of use or value’ (apparently on the pattern of pairs such as amount, mount ), from Old French valoir, from Latin valere ‘be strong, be of value’.
wiktionary
From Middle English availen(“to be of use”), from Old French a(“to”) + vail (from valoir(“to be worth”)).
etymonline
avail (v.)
c. 1300, availen, "to help (someone), assist; benefit, be profitable to; be for the advantage of; have force or efficacy, serve for a purpose," apparently an Anglo-French compound of Old French a- "to" (see ad-) + vaill-, present stem of valoir "be worth," from Latin valere "be strong, be worth" (from PIE root *wal- "to be strong"). Related: Availed; availing. As a noun, from c. 1400.
