Definition of countersink in English:

countersink

verb

[WITH OBJECT]
  • 1 Enlarge and bevel the rim of (a drilled hole) so that a screw, nail, or bolt can be inserted flush with the surface:

    ‘drill and countersink the hole for mounting the ladder to the wall’
    • ‘All the clamp holes of the panels were countersunk with this bit so that the screw heads are flush.’
    • ‘I've also countersunk the holes so no screwheads stick up later on.’
    • ‘Drill and countersink screw holes for mounting screws.’
    • ‘Construction began by countersinking the holes for the bolster rivets slightly.’
    • ‘Drill four 3/16-inch clearance holes in each rib before countersinking the top surface to bring the screw head flush.’
    1. 1.1 Drive (a screw, nail, or bolt) into a countersunk hole:
      ‘countersunk screw heads’
      • ‘Use a nail punch to countersink all nail heads approximately 1/8 ‘below the wood surface.’’
      • ‘I used regular wood screws and countersunk them in the PVC to allow a flush surface.’
      • ‘Use 12 or 16 HDG finishing nails and countersink them with a nail set.’
      • ‘Flat heads are always countersunk or rest flush with the surface.’
      • ‘There is a second layer of plexi to attach to this, so I countersunk the screwheads so they were flush’
      • ‘A thin layer of thinset adhesive is applied to the top of the plywood using a notched trowel, then the cement board is put in place and secured with flathead screws that are countersunk into the surface.’
      • ‘You can even countersink and cover the screws with a dab of caulk.’
      • ‘Imagine driving a two-inch finish nail into solid oak with no predrilling and having it perfectly countersunk, all in less time than it takes to pick up a hammer.’
      • ‘After the first sanding, check to see if any nails are now protruding, and, if so, countersink them.’
      • ‘Depending on how far the bolts stick out beyond the boards, we either countersink the nuts or wrap two layers of duct tape over the ends of the bolts to prevent damage to the greenhouse film.’
      • ‘Keep in mind, if you are using spring metal, that the nail heads should be slightly countersunk so that they do not catch on the opposite rail when the window is opened.’
      • ‘It's helpful to first pre-drill a small hole in the wood where you want to countersink the brass screws.’
      • ‘Search out any protruding nail heads and countersink them with a nailset.’
      • ‘Nail heads should be flush with the surface, but not countersunk as it can cause the backer board to crack or break.’
      • ‘Fasten the bottom of each brace with a 6-inch machine bolt and countersink the washer and nut.’
      • ‘When applying directly over an old floor, countersink any protruding nails and sand off any paint, wax, or varnish that might affect the adhering ability of the adhesive.’
      • ‘Just get plenty of screws in and make sure that they are countersunk and that they hit the studs.’
      • ‘To help prevent recurrence, countersink the nails and swab the holes with a water repellent.’
      • ‘First, countersink the nails and swab the holes with a water repellent.’
      • ‘Then secure with 1-inch drywall screws, making sure they are countersunk.’

Pronunciation:

countersink

/ˈkaʊntəsɪŋk/