noun
a slit or loop through which a button is passed to fasten a garment
verb
to make a buttonhole in (a garment)
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The tailor carefully sewed a buttonhole on the lapel of the suit jacket.
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I struggled to button my shirt through the tiny buttonhole.
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Hey, can you help me with this buttonhole? It's driving me crazy!
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She managed to buttonhole the CEO at the networking event and pitch her idea.