Switchblade
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Safin（讨论 | 贡献）2022年4月29日 (五) 07:31的版本 （建立内容为“Category:etymology == wiktionary == [https://en.wiktionary.org/wiki/switchblade ref] switch + blade == etymonline == [https://www.etymonline.com/word/…”的新页面）
wiktionary
switch + blade
etymonline
switchblade (n.)
also switch-blade, type of folding pocket knife, 1932, from switch (n.) + blade. So called for the "switch" which is pressed to spring the knife open. Earlier a similar tool was known as an Arkansas toothpick (1837) and a clasp-knife (1755).
