help mmtimeout

mmtimeout
mmtimeout <mission ID> [<mission ID>...]
mmtimeout all [mini type]
mmtimeout ALL [mini type]

If a minimission is supplied, that mini is instantly timed out and cleaned up, regardless of whether its deadline has been reached.
Otherwise, this command will time out all minis whose deadline has been reached. For non-coders, this will only affect minis in the missionsboard in the same room as you, but coders can affect any mini in the game.
This command is called automatically when mmadd is used with no arguments.
You can supply multiple mission ids to be timed out at once, or you can supply a minimission type. In that case, "ALL" removes every instance of the minimission from the whole game, and "all" will remove only those instances of it available on your current missions board.
Finally, timing out "all" removes every mini posted to your current missions board, and timing out "ALL" removes every mini posted in the game.

See also:
mmadd, mmlist, minis, nowminis