buttonhole - definition and synonyms

noun [countable] 

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/ˈbʌt(ə)nˌhəʊl/
singularbuttonhole
pluralbuttonholes
  1. 1
    a small hole in a piece of clothing through which you push a button to fasten it
     Synonyms and related words
  2. 2
    British a flower that you wear on your clothes, for example at a wedding