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*(up)on someone

Fig. to be someone's obligation or responsibility. (*Typically: be ~; lie ~.) The obligation is upon you to settle this. The major part of the responsibility is on you.

*on someone or something

[incriminating or harmful information] about someone or something. (*Typically: get something ~; have something ~; give someone something~.) I've gotten something on Albert that would really shock you. She is trying to get something on her husband so she can divorce him.

on something

1. taking a medication. I am on an antibiotic for my chest cold. I want you to be on this drug for another week.

2. taking an illegal drug or controlled substance and acting strangely. What is the matter with that kid? Is he on something? She acted as if she were on barbiturates or something.

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