undoer

One who reverses

An undoer is someone or something that undoes—reverses, unfastens, or brings to ruin.

A person who unties knots is an undoer of knots.

Pride may be the undoer of ambitious plans.

In software, an undoer is a function that reverses recent actions: The app's undoer lets you restore deleted text.

destruction

saboteur

One who deliberately undermines

nemesis · downfall · unraveler · defeater · destroyer · underminer · corrupter · bane · hubris · temptation

reversal

rollback

Return to prior condition

cancellation · repeal · nullification · invalidation · rescission · withdrawal · abrogation · overturning · backpedaling · u-turn

correction

fix

Repair or solution

rectification · emendation · redress · adjustment · modification · refinement · tweaking · repair · patch · debugging

restoration

recovery

Regaining what was lost

reconstruction · mending · restitution · reparation · reverter · restorer · healer · reconciliation · reclamation · salvage

Opposites
creation vs destruction

undoercreator

One who produces something

maker · builder · originator · constructor · producer

maintaining vs reversing

undoerpreserver

One that maintains or saves

maintainer · sustainer · protector · keeper · upholder

completion vs reversal

undoerdoer

Person who acts

accomplisher · finisher · achiever · completer · fulfiller

Phrases
Family

undo, undone, undoing, undoes, undoers

Familiarity
Top 500,000
Profile
Used worldwide · Timeless · Everyday, not technical · Rated G