Definitions
1.NounA dish or foodstuff where at least one piece, but typically two or more pieces, of bread serves as the wrapper or container of some other food.
2.NounAny combination formed by layering one type of material between two layers of some other material.
3.NounA layer cake or sandwich cake.
4.NounA sandwichman (one who wears a sandwich board).
5.Noun↑ Lynne Murphy (28 May 2014) "sandwiches, more particularly bacon sandwiches" Separated by a Common Language
6.VerbTo place (an item) physically between two other, usually flat, items.
7.VerbTo put or set between two other events in time.
8.VerbTo double penetrate.
9.VerbTo feed sandwiches to.
10.VerbTo eat sandwiches.
11.AdjectiveOf a meal or serving size that is smaller than a dinner. (Can we add an example for this sense?)