pin ‧ a ‧ fore /ˈpɪnəfɔː $ -fɔːr/ BrE AmE noun [countable]
[ Date: 1700-1800 ; Origin: pin + afore 'in front' ( ⇨ ↑ aforementioned ) ]
1 . ( also ˈpinafore ˌdress British English ) a dress that does not cover your arms and under which you wear a shirt or ↑ blouse SYN jumper American English
2 . ( also pinny British English informal ) a loose piece of clothing that does not cover your arms, worn over your clothes to keep them clean ⇨ apron