This is a very useful extended article (worth reading in full)
50 Shades Of Gaslighting: Disturbing Signs An Abuser Is Twisting Your Reality
By Shahida Arabi
Updated September 29, 2018
"Gaslighting, explained.
How do you convince someone that something they know to be true isn’t? In psychology, what is known as the “illusory truth effect” is a phenomenon in which a listener comes to believe something primarily because it has been repeated so often. When an abuser continually tells you that you are oversensitive or that what you are experiencing is in no way abuse, you begin believing it, even if you know deep down it isn’t true.
In other words, a lie that is repeated long enough eventually can be seen as the truth. (continues)
Gaslighting in Conversations
What does gaslighting look like in day to day conversations? It usually involves some form of the following:
Malignant repetition of falsehoods. As noted previously, repeating a lie frequently enough can become a way to reinforce and cement it as truth. Whether these lies are seemingly innocuous or potentially damaging, they can overwrite existing perceptions.
Projection and generalization – The gaslighter diverts the claim back to the victim, claiming that he or she is the one who “always” creates trouble, when in fact, it is the gaslighter who is perpetually creating chaos and refusing to validate the victim’s claims. The gaslighter then generalizes all of the victim’s claims and assertions as ridiculous or characterizes them as attempts to create conflict, as if conflict did not already exist in the first place.
Withholding information and stonewalling – The abuser is unwilling to engage in the conversation at all and often shuts down the conversation any time a claim is made against him or her about their behavior.
Questioning their memory, emotional stability and/or competence – The abuser avoids accusations and conversations by questioning the victim’s memory or ability to comprehend the situation in an unbiased way.
They may say things like, “I don’t remember that. Are you sure you’re remembering that correctly?” even if the event just happened a few moments ago.
Bringing in a third party/the triangulation maneuver. Triangulation is the act of bringing in another person into the dynamic of a toxic interaction. While we usually talk about triangulation in the context of manufacturing love triangles, when it is used in gaslighting, it can manifest quite differently.
Triangulation (in the context of gaslighting) can be used to confirm the abuser’s version of reality and shame you into believing that you truly are alone in your beliefs and perceptions.
Malignant narcissists are prone to recruiting what the survivor community refers to as “flying monkeys” to agree with their perspective. They may bring these people in physically to confirm their point of view (“Hey Sandra, what do you think? Isn’t Laura being paranoid?”), or even mention them in passing (“Even Sandra agreed with me that you’re being a bit paranoid, Laura”).
Diversions from the topic to assassinate the victim’s character or challenge the validity of the relationship. The gaslighter diverts the focus from his or her behavior onto the perceived character traits of the victim or the stability of the relationship. (continues)
thoughtcatalog.com/shahida-arabi/2017/11/50-shades-of-gaslighting-the-disturbing-signs-an-abuser-is-twisting-your-reality/
I've edited down the examples given so as not to create too long a post