Gaslighting

Meaning: The act or practice of grossly misleading someone, especially for a personal advantage. Its origins come from a 30s play where a man tries to trick his wife into believing she is insane

Nominated by: Merriam-Webster

Why? The US dictionary maker says gaslighting is a "word for our time", pointing to how the decades-old term sits with more modern forms of deception, such as fake news or deepfakery