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Phrase(s): A nod is as good as a wink to a blind horse.
Prov. You cannot get people to take a hint if they are determined not to. • Jill: I keep hinting to the boss that I deserve a raise, but he doesn’t seem to get the point. Jane: I’m not surprised. A nod’s as good as a wink to a blind horse.
McGrawhill's American Idioms And Phrasal Verbs