单词	countersink
释义	coun·ter·sink I. \|kau̇ntə(r)+\ transitive verb (countersunk \“+|səŋk\ ; countersunk ; countersinking ; countersinks) Etymology: counter- + sink 1. : to make a countersink on (a hole) 2. : to set the head of (as a screw) at or below the surface especially by means of a countersink II. \ˈ ̷ ̷ ̷ ̷+ˌ-\ noun 1. : a funnel-shaped enlargement at the outer end of a drilled hole usually for the reception of a screw, bolt, or rivet head 2. : a bit or drill for making such an enlargement — compare counterbore
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