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Phrase(s): You can lead a horse to water, but you can’t make it drink.
Prov. You can present someone with an opportunity, but you cannot force him or her to take advantage of it. • Jill: I told Katy about all the jobs that are available at our company, but she hasn’t applied for any of them. Jane: You can lead a horse to water, but you can’t make it drink.
McGrawhill's American Idioms And Phrasal Verbs