otherwise; if not; or (else)

Hurry up, or you will be late.

One must have conviction in law, or its existence will be superficial only.

Otherwise, it is considered impolite to pass food with the left hand, because the left hand is used for bathing.

One can't go beyond one's limits with exercising and stay within the bounds of what one can do. Otherwise, it can have negative effects on the body.

This process must be stopped immediately, otherwise the server will break down.