To disarm someone or something means to take away their ability to fight or cause harm. It can also mean to make someone feel more comfortable and less threatened.
When people talk about disarming each other, they often mean removing weapons or dangers that could hurt someone. For example, if two countries are having a disagreement and decide to stop building nuclear bombs, we might say they're disarming their arsenals. The phrase can also be used in everyday life when we want to calm someone down. If you have a friend who's very angry with you, and you do something nice for them, it could help disarm their anger. It's like taking away the fuel that made the fire burn so hot.
Note: There is one other meaning of "disarm" in English, as a verb intransitive. For example: "The company has chosen to disarmed itself from any social media platforms." In this case, it means giving up or withdrawing from something, usually because you feel overwhelmed or unable to keep up with the challenges associated with it.
To deprive of weapons; to deprive of the means of attack or defense; to render defenseless.
