"Toughening" is a word in ENGLISH

To subject to great heat, and then cool slowly, as glass, cast iron, steel, or other metal, for the purpose …

To harden; to toughen; to make hardy.

ganót - Tough, stiff, rigid; to stiffen, toughen, make rigid or inflexible. But mostly used in the form paganót with …

To make smooth or plane, as a metallic surface; to condense, toughen, and polish by light blows with a hammer.

tahí - To toughen, harden new earthenware by roasting salt in it, so that it may not easily crack. Tahihá …

To grow or make tough, or tougher.

of Toughen