pinafore

UK: /ˈpɪnəfɔː^r/ US: /ˈpɪnəˌfɔr/ ,(pin′ə fôr′, -fōr′)

WordReference Random House Learner's Dictionary of American English © 2025

pin•a•fore /ˈpɪnəˌfɔr/   n. [countable]

1. Clothing a sleeveless, apronlike piece of clothing, usually having buttons or a sash at the back, worn by girls and women over a dress or with a blouse.

pin•a•fored, adj. 

WordReference Random House Unabridged Dictionary of American English © 2025

pin•a•fore  (pin′ə fôr′, -fōr′), n. 

1. Clothing a child's apron, usually large enough to cover the dress and sometimes trimmed with flounces.
2. Clothing a woman's sleeveless garment derived from it, low-necked, tying or buttoning in the back, and worn as an apron or as a dress, usually over a blouse, a sweater, or another dress.
3. Clothing, British Terms [Chiefly Brit.]
   • a large apron worn by adults.
   • a sleeveless smock.

• pin + afore 1775–85

Collins Concise English Dictionary © HarperCollins Publishers::

pinafore / ˈpɪnəˌfɔː/ noun

1. an apron, esp one with a bib
2. 
   short for pinafore dress
3. an overdress buttoning at the back

Etymology: 18th Century: from pin + afore