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Phrase(s): Well begun is half done.
Prov. Beginning a project well makes it easier to do the rest.; Once you have begun a project well, you do not need to put in much more effort to finish it. • Jill: I’m afraid I’ll never be able to finish writing this report. Jane: You’ve already written a good introduction. Well begun is half done.
McGrawhill's American Idioms And Phrasal Verbs