Webster's English Dictionary

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buttonhole

1. but.ton.hole \-.ho-l\ n : a slit or loop for fastening a button 
2. buttonhole vt 1: to furnish with buttonholes  2: to work with buttonhole 
   stitch  - but.ton.hol.er n
3. buttonhole vt [alter.of buttonhold] : to detain in conversaton by or as 
   if by holding on to the outer garment s of