i'm using it in the sense of English - its not a specialist term or a piece of jargon. i.e. I mean 'undo', 'revert', 'reverse' - unpick just feels more appropriate because its often a fiddly process if you are doing anything more than a simple revert or back-out type operation.

Sounds like the opposite of cherry-pick.

i'll edit it since its confusing. in hindsight undo is the obvious choice of word