‘Else’ is not commonly used in English today but the meaning does fit. From Webster’s (1913):
Else, adverb or conjunction
1. Besides; except that mentioned; in addition; as, nowhere else; no one else.
2. Otherwise; in the other, or the contrary, case; if the facts were different.
“For thou desirest not sacrifice; else would I give it.” – Ps. li. 16.
After ‘or’, else is sometimes used expletively, as simply noting an alternative. “Will you give thanks, … or else shall I?” – Shak.
You can also say "elsewise", which to me still sounds a little old school, but more natural than just using "else" like we do in programming languages.
It's almost tempting to reach for "elsewhen" or "elsewhy", since we have "elsewhere". But if saying "elsewise" feels like chatting with a very elderly relative, saying those ones feels more like a seance with distant ancestors. But apparently it used to be a thing!
https://en.wiktionary.org/wiki/elsewho#English
https://en.wiktionary.org/wiki/elsewhither#English
https://en.wiktionary.org/wiki/elsewhence#English
https://en.wiktionary.org/wiki/elsehow#English
https://en.wiktionary.org/wiki/elsewards#English
Else doesn't sound archaic to my ears.
"When you go shopping make sure to buy flour or else we won't be able to bake the cake"
"otherwise" is a more common word choice but "else" is definitely in the active vocabulary of modern English speakers.
It’s often used as a threat, without specifying the threat, do this, or else!
"Else" is definitely extremely commonly used in English today, just not in the US. The UK says "else" instead of otherwise. "We'll see if the bar is open, else we can go across the street".
"...or else you'll..."
> Else’ is not commonly used in English today
I feel like I’m going crazy reading this thread today. Else is not a rare or archaic word.