What does "or else" mean?

in place of, or as an alternative to

What is a synonym for "or else"?

Common synonyms include: alias, alternatively, arui, else, instead, on the other hand.

conj, phrase

conj, phrase ·Rare ·Advanced level

Adverb

Conjunction

1
Otherwise or as an alternative.
"Go now, or else you'll have to stay all night."

Phrase

1
Implies an unspecified threat if a preceding command is not fulfilled. idiomatic
"Clean up your room, or else!"

"Go now, or else you'll have to stay all night."