Definition of countersink in English:


Syllabification: coun·ter·sink
Pronunciation: /ˈkountərˌsiNGk

verb (past and past participle countersunk /-ˌsəNGk/)

[with object]
  • 1Enlarge and bevel the rim of (a drilled hole) so that a screw, nail, or bolt can be inserted flush with the surface.
    More example sentences
    • Drill and countersink screw holes for mounting screws.
    • Drill four 3/16-inch clearance holes in each rib before countersinking the top surface to bring the screw head flush.
    • I've also countersunk the holes so no screwheads stick up later on.
  • 1.1Drive (a screw, nail, or bolt) into a countersunk hole.
    More example sentences
    • It's helpful to first pre-drill a small hole in the wood where you want to countersink the brass screws.
    • Flat heads are always countersunk or rest flush with the surface.
    • 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.

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Word of the day skosh
Pronunciation: skəʊʃ
a small amount; a little