0 a performance or sports event for which no more tickets are available, because it is so popular: --
The concert was a sellout.
1 a situation in which someone does not do what they have promised to do or what they should do: --
2 A sellout performance or sports event has no more tickets available, because it is so popular: --
3 the selling of all the tickets to an event, or of all available items: --
Saturday’s show was a sellout.
4 the act of doing something selfishly for money, without considering principles or damage to others: --
The peace deal was praised by some as a courageous breakthrough while others condemned it as a sellout.