pinafore /ˈpɪ.nəˌfɔ(ɹ)/noun 1verb 1forms 3 noun1 •A sleeveless dress, often similar to an apron, generally worn over other clothes, and most often worn by young girls as an overdress.“He looks just like an angel,” said the Charity Children as they came out of the cathedral in their bright scarlet cloaks, and their clean white pinafores. — 1888 verb1 •To dress in a pinafore. formspinafored · pinaforing · pinafores