The definition of have big shoes to fill is:
(idiom) to have to meet high expectations about something that came before
Our new teacher has big shoes to fill, because our old teacher was so great!
A: I heard you have a new girlfriend, that’s great!
B: Yeah, but I have big shoes to fill.
A: Why is that?
B: Her last boyfriend was rich and famous, and I’m just a regular guy!
Samantha’s older sister went to Harvard, graduated with honours, and now has a successful career. Samantha has big shoes to fill!
`From the Blogs: