impose on
impose on {v.}
To try to get more from (a person who is helping you) than he or she intended to give.
Don't you think you are imposing on your neighbor when you use his telephone for half an hour?
You may swim in the Allens' pool so long as you do not impose on them by bringing all your friends.
Compare: TAKE ADVANTAGE.
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Source: A Dictionary of American Idioms