出典:Wiktionary
出典:『Wiktionary』 (2026/03/26 23:21 UTC 版)
From back- + countersink.
back-countersink (third-person singular simple present back-countersinks, present participle back-countersinking, simple past back-countersank or back-countersunk, past participle back-countersunk)
back-countersink (plural back-countersinks)