Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of toughen is as below...

Endure :: Endure (v. t.) To harden; to toughen; to make hardy.

Anneal :: Anneal (v. t.) To subject to great heat, and then cool slowly, as glass, cast iron, steel, or other metal, for the purpose of rendering it less brittle; to temper; to toughen..

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

Toughen :: Toughen (v. i. & t.) To grow or make tough, or tougher..

Toughened :: Toughened (imp. & p. p.) of Toughe.

Toughening :: Toughening (p. pr. & vb. n.) of Toughe.

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