To disarm means to take weapons away from someone, making them unable to fight. Police officers might disarm a suspect by removing their gun. After a war ends, the winning side often demands that the losing army disarm by surrendering all their weapons. Countries sometimes negotiate disarmament treaties, agreeing to reduce or eliminate certain weapons to make the world safer.

The word also means to remove someone's anger or suspicion through charm or friendliness. When you disarm someone this way, you make them lower their defenses and stop being hostile. A student who arrives late to class might disarm an annoyed teacher with a sincere apology and a smile. A clever joke can disarm tension in an awkward situation.

You might hear someone described as having a disarming smile, meaning their friendliness is so genuine that it melts away any suspicion or unfriendliness others might feel. What makes this powerful is its gentleness: you're not forcing someone to change their mood, you're giving them a reason to want to.