ただじゃおかないぞ

also: ただじゃおかねえぞ · ただじゃおかんぞ · ただではおかんぞ · ただではおかないぞ

Meanings

expression

you'll pay for this!; I won't let you get away with this!

A threatening masculine expression used when the speaker intends to retaliate or make someone regret their actions. The second gloss 'you'd better keep your mouth shut!' is a contextual interpretation when the threat is about revealing secrets.

よくも騙だましたな。ただじゃおかないぞ。
How dare you trick me. You'll pay for this!
このことは誰だれにも言いうなよ。言いったらただじゃおかないぞ。
Don't tell anyone about this. If you do, you'll regret it.

Written forms

ただじゃおかねえぞ
Colloquial masculine variant with ねえ for ない; common in rough or informal speech.
ただじゃおかんぞ
Dialectal or old-fashioned masculine variant with おかん for おかない; heard in some regional or period speech.
ただじゃおかねぇぞ
Search-only kana form; same as ただじゃおかねえぞ with small ぇ.

Similar words

ただでは済すまない
Similar threatening nuance, but ただでは済まない is a more general statement ('it won't end without consequences'), while ただじゃおかないぞ is a direct personal threat ('I won't let you off').

Etymology

From ただ (free, without cost) + では/じゃ (conditional/contrastive particle) + おかない (negative of 置く, here meaning 'leave it at that') + emphatic sentence-ending particle ぞ. Literally 'I won't leave it for free', i.e., 'I'll make you pay for it'.