What is Sandwich ?
Sandwich is (noun) a snack made with two slices of bread with meat, cheese, etc. and sometimes salad between them She ordered a cheese sandwich and a cup of coffee. What sort of sandwiches do you want to take for your lunch? I didn’t have a big meal – just a sandwich with some beer in the pub.(verb) to put something be- tween two others I stood all the way home on the Underground, sandwiched between two fat men.
source: Easier English, Student Dictionary Upper Intermediate Level