1. 欢送会;送行;送别
    If a group of people give someone who is going away a send-off, they come together to say goodbye to them.

send-off的反义词

    e.g. All the people in the buildings came to give me a rousing send-off.
           大楼里所有的人都热情地来给我送行。

1. an organized expression of goodwill at the start of a trip or new venture

    Synonym: bon voyage

2. a start given to contestants

    e.g. I was there with my parents at the kickoff

    Synonym: kickoffstart-off