gaslighting

The Japan Times Dec.16にこんな記事がありました。

Merriam-Webster’s word of the year is ‘gaslighting,’ and don't try to tell us there isn't a Japanese equivalent
Merriam-Webster saw a huge spike in people looking up the word “gaslighting” in 2022, and Japan is also no stranger to the concept.

実際に Merriam-Webster Dictionaryには 'Gaslighting,' plus 'sentient,' 'omicron,' 'queen consort,' and other top lookups of 2022とあり、“gaslighting” の項に次の説明があります。

psychological manipulation of a person usually over an extended period of time that causes the victim to question the validity of their own thoughts, perception of reality, or memories and typically leads to confusion, loss of confidence and self-esteem, uncertainty of one's emotional or mental stability, and a dependency on the perpetrator

Gaslighting can be a very effective tool for the abuser to control an individual. It's done slowly so the victim writes off the event as a one off or oddity and doesn't realize they are being controlled and manipulated.

“gaslighting” の検索が多くなった背景としてMerriam-Websterはこう書いてあります。
In this age of misinformation—of “fake news,” conspiracy theories, Twitter trolls, and deepfakes—gaslighting has emerged as a word for our time.