Here are some examples of how "chime in" can be used:
* "We were discussing the new movie when John chimed in with his thoughts."
* "The teacher asked for opinions, and several students chimed in with their ideas."
* "I was just telling a story when she chimed in to say she had seen the same thing happen."
The phrase "chime in" suggests that someone is joining a conversation that is already in progress, often in a spontaneous and informal way.