Значение идиомы have on

[have on] {v.} 1. To be dressed in; wear.

Mary had on her newdress.

2. To have planned; have an appointment; plan todo.

Harry has a big weekend on.

I’m sorry I can’t attend yourparty, but I have a meeting on for that night.

3. See: HAVE NOTHINGON, HAVE SOMETHING ON.