さもないと

さもないと
conjunction
otherwise; or else
grammatical
1. otherwise; or else; if not
Used to warn about negative consequences if something is not done.
Hurry up. Otherwise, we won't make it.
Go to bed early. Or else you won't be able to get up tomorrow.
Take an umbrella. Otherwise, you'll get wet.
Study properly. Otherwise, you'll fail the exam.
You should apologize right now. Otherwise, it might become an even bigger problem.

Usage

さもないと connects two sentences where the first states an action or suggestion, and the second warns of a negative consequence if that action is not taken.

Common patterns

[command or advice]。さもないと [bad consequence]。

Etymology

さ (an old word for "so", like そう) + も + ない + と: literally "if it is not so".

Forms

Similar words

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Somewhat literary or dramatic. In everyday casual speech, そうしないと or じゃないと are more common.