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Difference between Have something on and Have something on one

have something on

1. be wearing smth.:

  • She was very pretty and had a lovely dress on.

2. be busy with smth.:

  • I’m sorry, I can’t come, I have two concerts on next week.

have something on one—(of money, etc.) carry about (also: have something on one’s person):

  • The man had a credit card on him that the police believed was stolen.