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单词 counterbore
释义

WordReference Random House Unabridged Dictionary of American English © 2024
coun•ter•bore  (kountər bôr′, -bōr′; kountər bôr, -bōr),USA pronunciation n., v., -bored, -bor•ing. 
n. 
  1. Buildinga tool for enlarging a drilled hole for a portion of its length, as to permit sinking a screw head.
  2. Buildingthe portion of the hole so enlarged.

v.t. 
  1. Buildingto enlarge (a drilled hole) along part of the length of the hole by drilling with a bit having a greater diameter.
  • counter- + bore1 1605–15
coun′ter•borer, n. 

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