(as) plain as a pikestaff
US /əz pleɪn əz ə ˈpaɪk.stæf/
UK /əz pleɪn əz ə ˈpaɪk.stæf/

1.
너무나 명백한, 아주 분명한
very obvious and easy to understand
:
•
His guilt was as plain as a pikestaff.
그의 죄는 너무나 명백했다.
•
The instructions were as plain as a pikestaff, so I don't know why he made a mistake.
지시사항은 너무나 명백했는데, 그가 왜 실수를 했는지 모르겠다.