Comment by jolmg

"or else" is redundant. One can omit one word or the other and it still works.

> When you go shopping make sure to buy flour, or we won't be able to bake the cake.

> When you go shopping make sure to buy flour, else we won't be able to bake the cake.

EDIT: TIL: Dictionaries don't commonly define "else" as a conjunction, except for Wiktionary. Still sounds natural to my ears, so this is a surprise.