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counterrevolution
counterrevolutionary
countersank
counterscarp
countershading
countershaft
countersign
countersignature
countersink
counterstain
countersubject
countersue
countersunk
countertenor
counterterror
counterterrorism
countertop
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countersink

coun·ter·sink [ kówntər sìngk ]


transitive verb  (past coun·ter·sank [ kówntər sàngk ] or coun·ter·sunk [ kowntər sùngk ], past participle coun·ter·sunk [ kowntər sùngk ], present participle coun·ter·sink·ing, 3rd person present singular coun·ter·sinks)
Definition:
 
1. make hole to include screw head: to widen the top of the hole for a screw or bolt so that the head will fit into the hole and be level with or below the surface

2. make screw heads level with surface: to place screws, bolts, or nails in wood or another material so that their heads are level with or below the surface of the material



noun  (plural coun·ter·sinks)
Definition:
 
1. hole that accepts screw head: a hole for a screw or bolt that is wider at the top so that the head will fit into the hole and be level with or below the surface

2. countersinking tool: a special drill bit or other tool for countersinking holes for screws or bolts

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