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Chinese
板上钉钉 / 板上釘釘 [bǎn​shàng​dìng​dīng]
that clinches it; that's final; no two ways about it
Notes
Example Sentences
Contains
板
bǎn いた 판
plank
上
shàng うえ 상
up
釘
dīng くぎ 정
nail