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To adopt or accept a rational, sensible course of action or assessment of a situation, especially after persuasion or a realization of error. I finally managed to make him see reason, and he agreed not to sell the family farm just yet. My grandma is never going to see reason about her smoking—by her logic, she's already got one foot in the grave, so why should she give up something that she still enjoys?
Adopt a sensible course of action, let oneself be persuaded, as in At ninety Grandma finally saw reason and gave up driving her car. This expression, which uses reason in the sense of "good sense," was first recorded in Shakespeare's 1 Henry IV (1:2).