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pin up
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Quick answer
As a verb, pin up means attach with or as if with a pin. As a noun, it means a very pretty girl who works as a photographer's model.
Meanings of pin up
2 meaningsverb
noun
A very pretty girl who works as a photographer's modelperson
Similar: cover girl, lovely
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).