Verb たら最後

At a glance

〜たら最後さいご means "once (something) happens, there is no going back". It says that after one action, a situation follows that cannot be stopped or undone, usually a bad one.

Verb た-form + ら最後、[result that can't be stopped or undone]

彼かれは飲のみ始はじめたら最後さいご、朝あさまで止とまらない。 Once he starts drinking, he doesn't stop until morning.

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How to form it

Make the verb's た-form, then add ら最後さいご. This is the same as the たら conditional plus 最後さいご.

Register: relatively colloquial and common in conversation. The variant 〜たが最後さいご means the same thing and is more literary.