buttonhole - definition and synonyms

verb [transitive] informal 

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/ˈbʌt(ə)nˌhəʊl/
present tense
I/you/we/theybuttonhole
he/she/itbuttonholes
present participlebuttonholing
past tensebuttonholed
past participlebuttonholed
  1. to stop someone and make them listen to what you have to say when they do not really want to