noun
A 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.
(by extension) Any combination formed by layering one type of material between two layers of some other material.
(UK) A layer cake or sandwich cake.
(archaic) A sandwichman (one who wears a sandwich board).
verb
(transitive) To place (an item) physically between two other, usually flat, items.
(transitive, figuratively) To put or set between two other events in time.
(transitive, sex) To double penetrate.
(transitive, informal) To feed sandwiches to.
(intransitive, rare) To eat sandwiches.
adjective
(US) Of a meal or serving size that is smaller than a dinner.