back-countersink

verb

To countersink from the backside of a workpiece by using a tool that passes through a through hole, deploys a cutting edge (or receives it by manual insertion from an operator), countersinks the far side, retracts the cutting edge (or has it removed), and then retreats back through the hole (toward the tool's origin).

“There's no second operation on these parts. The backside features are all back-counterbores and back-countersinks.”

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Meanings

verbback-countersink (third-person singular simple present back-countersinks, present participle back-countersinking, simple past back-countersank or back-countersunk, past participle back-countersunk)

present singular third person back-countersinks · participle present back-countersinking · past back-countersank · past back-countersunk · participle past back-countersunk

  1. engineeringTo countersink from the backside of a workpiece by using a tool that passes through a through hole, deploys a cutting edge (or receives it by manual insertion from an operator), countersinks the far side, retracts the cutting edge (or has it removed), and then retreats back through the hole (toward the tool's origin).

    We won't need any second operation on these parts. We're going to back-counterbore and back-countersink all of these features on the backside.

nounback-countersink (plural back-countersinks)

plural back-countersinks

  1. A countersink that is so made.

    There's no second operation on these parts. The backside features are all back-counterbores and back-countersinks.

Origin

From back- + countersink.

Full word history & related roots →
Cite this entry
APA

back-countersink. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/back-countersink

MLA

“back-countersink.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/back-countersink. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “back-countersink,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/back-countersink.

Source: back-countersink on Wiktionary, CC BY-SA 4.0.