Definition of breadcrumbs:
(n) :
(chiefly in the plural) A tiny piece of bread, either one that falls from bread as it is cut or eaten, or one made deliberately by crumbling bread.
(n) :
(graphical user interface, chiefly in the plural) A single link in a chain indicating the hierarchical location of a directory, web page or similar, used as a navigation aid.
(v) :
(transitive, cooking) To sprinkle breadcrumbs on to food, normally before cooking.
(n) :
(figuratively, in the plural) One in a series of clues leading to a person or place.
(n) :
(programming, chiefly in the plural) A fragment of data that serves to log the actions taken by a program, used in debugging.
(v) :
(graphical user interface, intransitive) To add navigational breadcrumbs to (a web page or user interface).