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[koun-ter-bawr, -bohr; koun-ter-bawr, -bohr] /ˈkaʊn tərˌbɔr, -ˌboʊr; ˈkaʊn tərˈbɔr, -ˈboʊr/

a tool for enlarging a drilled hole for a portion of its length, as to permit sinking a screw head.
the portion of the hole so enlarged.
verb (used with object), counterbored, counterboring.
to enlarge (a drilled hole) along part of the length of the hole by drilling with a bit having a greater diameter.


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  • Counter-boulle

    [koun-ter-bool] /ˈkaʊn tərˌbul/ noun 1. .

  • Counterbrace

    [koun-ter-breys] /ˈkaʊn tərˌbreɪs/ noun, Engineering, Building Trades. 1. a web member of a truss subject to tension or compression under varying conditions.

  • Counterchange

    [koun-ter-cheynj] /ˌkaʊn tərˈtʃeɪndʒ/ verb (used with object), counterchanged, counterchanging. 1. to cause to places, qualities, etc.; interchange. 2. to diversify; checker. /ˌkaʊntəˈtʃeɪndʒ/ verb (transitive) 1. to change parts, qualities, etc 2. (poetic) to chequer, as with contrasting colours

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