COUNTERBORE

counterbore, countersink, countersink bit

(noun) a bit for enlarging the upper part of a hole

Source: WordNet® 3.1


Etymology

Noun

counterbore (plural counterbores)

A cylindrical recess, typically machined around a hole to admit a screw so that it sits flush with a surface.

The tool with which a counterbore is machined.

Verb

counterbore (third-person singular simple present counterbores, present participle counterboring, simple past and past participle counterbored)

(transitive) To create such a cylindrical recess.

Source: Wiktionary


Coun"ter*bore` (-br`), n.

1. A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head.

2. A kind of pin drill with the cutting edge or edges normal to the axis; -- used for enlarging a hole, or for forming a flat-bottomed recess at its mouth.

Coun`ter*bore" (koun`tr-br"), v. t.

Definition: To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.

Source: Webster’s Unabridged Dictionary 1913 Edition



RESET




Word of the Day

17 January 2025

OBSERVE

(verb) conform one’s action or practice to; “keep appointments”; “she never keeps her promises”; “We kept to the original conditions of the contract”


coffee icon

Coffee Trivia

Some 16th-century Italian clergymen tried to ban coffee because they believed it to be “satanic.” However, Pope Clement VII loved coffee so much that he lifted the ban and had coffee baptized in 1600.

coffee icon