Expel/ɪkˈspel/ Definition 1 of 3Pro Tip 1/3Negative Consequence Expel often infers serious wrongdoing and is a last resort in schools or organizations. After the incident, the university decided to expel him. Pro Tip 2/3Formal Action Using 'expel' suggests an official, formal decision, not an informal or personal one. The committee voted to expel the member for violating the rules. Pro Tip 3/3Irreversibility When someone is expelled, it's often permanent and not just a suspension. She was expelled and wasn't allowed to return.