GRAMMAR DETAIL
が最後
Expresses the conviction that once an action begins, an undesirable outcome will be difficult to avoid.
Examples
この計画を公表したが最後、簡単には撤回できない。
Once this plan is made public, it cannot easily be withdrawn.
Words used
一度約束したが最後、後には引けない。
Once I have made a promise, there is no backing out.
Words used
秘密を口にしたが最後、もう後戻りはできない。
Once you let the secret slip, there is no turning back.
Words used
Study notes
1. Origins, structure, and basic meaning
- Structure: Attach
が最後to a verb's ta-form to assert that once the action happens, an irreversible or unavoidable consequence follows. - Basic usage:
この計画を公表したが最後、簡単には撤回できない。warns that once the plan is made public, it cannot easily be withdrawn.
2. Common pitfalls and similar expressions
- Conditional use of the ta-form
- The
たin公表したが最後does not necessarily mean publication has already happened. Here it strongly anticipates the consequence if publication occurs.
- The
- Stronger consequence than たら
約束したらgives the condition of making a promise.約束したが最後highlights the difficulty of backing out afterward.