Definitions

1. verb

to remove or get rid of a stain or discoloration

“The cleaner tried to unstain the carpet before it was too late.”

2. verb

to free or remove something from a stain or taint

“The charity work helped to unstain the city’s reputation after the natural disaster.”

3. noun

the act of removing a stain or discoloration

“The unstain of the old painting was a delicate process that required great care.”