замещать

fill one's shoes

...another actor could have filled his shoes and made that film work... — другой актер мог бы заменить его и заставить фильм "выстрелить"

mind the store — to take charge while the senior person is away

Who's gonna be minding the store while your account manageress is away on her maternity leave? — Кто заменит вашу бухгалтершу, пока она в декрете?

substitute (to do someone's job until the person who usually does it is able to do it again)

{US} substitute for

Bill substituted for Larry, who was off sick. (LDOCE)

cover for sb (do the work that someone else usually does, because they are not there)

Example:Who's covering for you while you're away?

fill in for sb (do someone else's work temporarily)

Example 1:Thanks so much. It was nice of you to fill in for me while I was in the hospital.

Example 2: You really did a great job filling in for James while he was sick.

see
[fill sb's shoes]