Word
Roll back
To roll back is to put the previous working version of your app back in front of customers, before anyone has worked out what went wrong.
Also called: rollback, revert, put the last version back
It fixes nothing, and it's not meant to. It buys you a quiet afternoon instead of an audience.
You'll meet it during your first bad hour, when the instinct is to diagnose first. Stop the damage, then find out why, with nobody watching.
The limit worth knowing: a roll back returns the code, not the world. A change that altered what the app stores, or an email that's already gone out, doesn't come back with it.