back to the drawing board

Adverb

idiomatic

(idiomatic) Back to the beginning following an unsuccessful attempt.

Japanese Meaning

失敗を受け、計画や作業を最初からやり直す状態 / うまくいかなかった試みの後、再び初めから計画を立てること

When the client rejected the proposal, we were back to the drawing board.

クライアントが提案を却下したとき、私たちは最初からやり直すことになった。

Sense（1）

(idiomatic) Back to the beginning following an unsuccessful attempt.

Well, that didn't work at all, so it's back to the drawing board, I guess.