overhardening

Verb

overharden (third-person singular simple present overhardens, present participle overhardening, simple past and past participle overhardened)

1. To harden too much.
   • [I]t has acquir'd ſuch a hardneſs, that being throvvn againſt the floor it vvould rebound, and vvas brittle like over-harden'd Steel.1661, Robert Boyle, “[Some Specimens of an Attempt to Make Chymical Experiments Useful to Illustrate the Notions of the Corpuscular Philosophy.] The History of Fluidity and Firmnesse. The Second...