(as) plain as a pikestaff
US /əz pleɪn əz ə ˈpaɪk.stæf/
UK /əz pleɪn əz ə ˈpaɪk.stæf/
1.
明白な, 非常に分かりやすい
very obvious and easy to understand
:
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His guilt was as plain as a pikestaff.
彼の有罪は明白だった。
•
The instructions were as plain as a pikestaff, so I don't know why he made a mistake.
指示は非常に明白だったので、彼がなぜ間違いを犯したのかわからない。