noun
(countable and uncountable) Leather that is used to make shoes.
(uncountable) Leather from which shoes are made that is worn out through walking.
(by extension, idiomatic) The sweat of one's brow; effort; investigatory effort.
(slang, figurative, somewhat derogatory) Tough meat, especially cheap meat.
adjective
(idiomatic) Basic, old-fashioned or traditional; specifically (journalism) shoe-leather journalism or shoe-leather reporting: journalism involving walking from place to place observing things and speaking to people, rather than sitting indoors at a desk.