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Meaning ofcountersinkin English

countersink

us/ˈkaʊntərsɪŋk/uk/ˈkaʊntərsɪŋk/

Pluralcountersinks
Past Tensecountersank
Past Participlecountersunk
Participle Verbcountersinking
Third Person Singularcountersinks

Definitions

Noun
1. a recess for a screw head; creating a flush surface
  The carpenter used a countersink to create a recess for the screw head.
2. a tool for cutting conical recesses
  A countersink tool is necessary for cutting conical recesses in metal or wood.
Verb
1. to cut a tapered hole (for screw fitting)
  To countersink the screws, we need to cut a tapered hole in the wood.