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oil-harden

American

[oil-hahr-dn] / ˈɔɪlˌhɑr dn /

verb (used with object)

Metallurgy.

to quench (steel) in a bath of oil.

Etymology

Origin of oil-harden

First recorded in 1900–05

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.