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Phrase Meanings » do one's duty
What does "do one's duty" mean?
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Do one's tasks or what is expected of one. For example, He was only doing his duty when he made the children finish their work. [Early 1500s]
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Defecate or urinate, as in Please keep the dog outdoors until he does his duty. This euphemism for attending to such needs is heard less often today. [1930s]