cardboard box UK /ˈkɑːd.bɔːd bɒks/US /ˈkɑɹd.bɔɹd bɑks/ noun4 •An industrially prefabricated box made from cardboard, primarily used for packaging goods or materials and often recycled. •A corrugated box. •(slang, offensive) Someone who is very dull and uninteresting. •(slang) Syphilis. formscardboard boxes · cardboard-boxes