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Related to fill shoes: in droves
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.
fill somebody's shoesalso step into somebody's shoes
to do what someone else has done as well as they did He was a great coach, and it's not going to be easy to get someone to fill his shoes.
fill (someone's) shoes
To assume someone's position or duties.