(as) plain as the nose on your face
US /əz pleɪn əz ðə noʊz ɑn jʊər feɪs/
UK /əz pleɪn əz ðə noʊz ɑn jʊər feɪs/

1.
明白な, 一目瞭然の
very obvious and easy to see or understand
:
•
The solution to the problem was as plain as the nose on your face, but I just couldn't see it at first.
問題の解決策は明白だったが、最初は全く見えなかった。
•
His guilt was as plain as the nose on your face; everyone in the room could tell he was lying.
彼の有罪は明白だった。部屋にいた誰もが彼が嘘をついていると分かった。