出典:Wiktionary
出典:『Wiktionary』 (2025/06/22 23:13 UTC 版)
From 中期英語 upturnen, equivalent to up- + turn.
upturn (plural upturns)
upturn (third-person singular simple present upturns, present participle upturning, simple past and past participle upturned) (ambitransitive)