v.1. To release or submit something, especially by mail or by electronic means: I sent off my application last week. I put a stamp on the letter and sent it off.
2. To order someone to leave in order to do something or to attend some event or place: The managers ordered a pizza and sent off an assistant to pick it up. My parents sent me off to boarding school when I was only ten years old.
3. To assist or be present at someone's departure: When I retired, my coworkers sent me off with a big party. A crowd gathered at the train station to send off the politician.
4. send off for To send a request for something, especially by mail: The mechanic sent off for a replacement part.
5. Sports To eject someone from a game, especially for a flagrant violation of the rules: The referee stopped the game and sent off two of the players for fighting. The umpire sent me off after I threw my tennis racket into the crowd.