1. a person who detains someone in conversation, especially in a persistent or unwelcome manner
Usage: informal
2. a sewing machine attachment that makes buttonholes

Examples

• The office buttonholer cornered me by the elevator for twenty minutes.
• She’s such a buttonholer that people avoid her at parties.
• I need to attach the buttonholer to finish this shirt.
• The new sewing machine comes with an automatic buttonholer.
• He’s a notorious buttonholer who never lets anyone escape his stories.
• The buttonholer makes perfectly sized holes for the buttons.