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Phrase(s): Make haste slowly. [and] More haste, less speed.
Prov. Act quickly, but not so quickly that you make careless mistakes. • Jane: Why are you throwing your clothes around the room? Alan: You told me to get my things packed in a hurry. Jane: Yes, but make haste slowly; otherwise we’ll have to spend an hour cleaning up the mess you make. • I know you want to finish that sweater by Joe’s birthday, but you’re knitting so fast that you make mistakes. More haste, less speed.
McGrawhill's American Idioms And Phrasal Verbs