Probably >95% of the use of "gaslight" that I see in writing is from the "Ask Amy" syndicated advice column (Amy Dickinson). It seems to be one of her favorite

Probably >95% of the use of "gaslight" that I see in writing is from the "Ask Amy" syndicated advice column (Amy Dickinson). It seems to be one of her favorite terms for describing what she sees as a form of emotional abuse in the scenarios presented to her by correspondents. Just a few months ago someone asked her specifically what the meaning of "gaslight" was, she replied: "“Gaslighting” refers to one person or entity making another person question their own reality. In the context most often seen here, one partner convinces another that their suspicions of cheating (for instance) are the result of irrational jealousy."