noun
a form of psychological manipulation in which a person seeks to sow seeds of doubt in a targeted individual
verb
to manipulate someone by psychological means into questioning their own sanity
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The act of gaslighting involves manipulating someone into questioning their own reality.
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I can't believe she's gaslighting you like that, just trust your instincts.
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Stop gaslighting me, I know what really happened!
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The constant lies and manipulation felt like emotional gaslighting.