さもなければ

conjunction

otherwise; or else; if not

Conjunction used to present an alternative or consequence, often with a warning or strong suggestion. Common in both spoken and written Japanese.

• 急いそいでください。さもなければ遅おくれますよ。

  Please hurry up. Otherwise, you'll be late.

• 彼かれは謝あやまるべきだ。さもなければ友とも達だちを失うしなうだろう。

  He should apologize. Otherwise, he'll lose his friends.