presume on (someone or something)

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presume on (someone or something)

To take advantage of someone or something in a presumptuous, unwarranted, or unwelcome manner. I always try to give my students the benefit of the doubt, but those who would presume on my leniency will find themselves facing harsh punishments. I'm your brother, Tim, I want to help you—just don't presume on me, that's all. Thank you for your offer, but I wouldn't want to presume on your hospitality.
See also: on, presume

presume (up)on someone or something

to take unwelcome advantage of someone or something. I didn't mean to seem to presume upon you. I apologize. I did not feel that you presumed on me.
See also: on, presume