I read the Wikipedia article about "gaslighting" and know it comes from a 1944 film of the same name in which an abusive husband gradually dims the gaslights at home – while denying doing so – to drive his wife mad.

Yet whenever I see the term used (which happens a lot, lately) I can't make the connection. It seems people use it for the simple act of lying or denying something, which to me is mostly just... lying, not "gaslighting". Any kind of stupid, misguided act is getting the sinister "gaslighting" stamp as if it some 5d chess move when it simply looks like incompetence. The core principle of it seems to revolve around having a plan to psychologically manipulate someone but I mostly don't see the plan nor the actual goal. If anything untruthful you say about an important topic is "gaslighting", then the term doesn't seem to have a lot of value on its own. Wikipedia actually mentions "unconscious" gaslighting which seems to contradict its purpose of actually wanting to manipulate someone.

So, given its popularity, I'm curious if there might be a (succinct) definition of the term that helps me understand it properly? Do you think it's just a trendy term to throw at politicians doing shit you don't like? Am I missing an important detail?