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Phrase(s): fill someone’s shoes
Fig. to take the place of some other person and do that person’s work satisfactorily. (As if you were wearing the other person’s shoes.) • I don’t know how we’ll be able to do without you. No one can fill your shoes. • It’ll be difficult to fill Jane’s shoes. She did her job very well.
McGrawhill's American Idioms And Phrasal Verbs