Re:Slackware 14.2 release candidate 1
by unixhero on Friday March 18, 2016 @11:26AM
(#11312374)
Grinding teeth,
the proverbial milling of stone... Also as in learning the ropes, or training oneself, learning the hard way, et cetera.
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I think the desired term is "to cut one's teeth on." It refers to how babies' teeth are aided in erupting from the gums by chewing on something tough. "Grinding one's teeth" is used to indicate being under an unpleasant level of stress.