What it means
さもないと means “otherwise” or “if not” and introduces the negative consequence that will follow if the preceding instruction, request, or condition is not fulfilled. It commonly appears in warnings, advice, and formal instructions, and often conveys urgency or an implicit threat. The consequence may be stated directly after it, usually with a comma in writing.
Usage note
さもないと is somewhat formal and is less suitable for casual, neutral statements about alternatives. It usually follows an instruction, request, or condition rather than directly attaching to an isolated noun or adjective.
How to use it
今すぐ出発してください。さもないと、終電に間に合いません。
Leave immediately; otherwise, you will not catch the last train.
今すぐ出発しなさい。さもないと、終電に間に合わない。
Leave immediately; otherwise, you will not catch the last train.
Example sentences
申請書の記入漏れがないか、提出前に必ず確認してください。さもないと、審査が大幅に遅れるおそれがあります。
Be sure to check for any omissions in the application form before submitting it. Otherwise, the review may be significantly delayed.
この薬は食後三十分以内に服用してください。さもないと、胃に強い負担がかかる可能性があります。
Please take this medicine within thirty minutes after eating. Otherwise, it may place a heavy burden on your stomach.