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Definition of: countersink
(koun′tər·singk′, koun′tər·singk′) v.t. ·sank or ·sunk, ·sunk (Obs. ·sunk·en), ·sink·ing
1. To cut or shape (a depression), as for the head of a screw.
2. To sink, as a bolt or screw, into a corresponding depression.
—noun (koun′tər·singk′)
1. A tool for countersinking.
2. A depression for a screwhead, bolt, etc.
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