1the raised, arched upper part of the human foot between the toes and the ankle
instep
2the bottom of a foot or shoe
sole
5a book bound in stiff paper or flexible card
paperback
6a complex, plot-driven mystery genre
whodunit
7(of a book) bound in stiff covers.
hardback
8a trial impression of a page, taken from type or film and used for making corrections before final printing
proof