Pronunciation: /ˈbʌt(ə)nhəʊl/
noun
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a slit made in a garment to receive a button for fastening.
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British a flower or spray worn in a buttonhole on the lapel of a jacket.
verb
[with object]-
1 informal attract the attention of and detain (someone) in conversation, typically against their will: reporters buttonhole officials coming out of the press secretary’s office
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2make buttonholes in (a garment).