or else

1. 否则; 要不然

They told me to leave at once, or else.

他们要我马上离开, 否则(对我不利)。

You will stay away from my girlfriend, or else.

离我女朋友远点, 否则要你好看。

Hurry up, or else you'll miss the train.

快点, 否则你要赶不上火车了。