Commentary: Syntax Includes: NP1[agent] HARDEN NP2[patient[inanimate]] NP1[topic[inanimate] HARDEN
After one too many disappointments, John hardened his heart.
The cold hardened the butter.
The factory hardens steel.
WordNet 3.0 Sense Numbers: 1, 2, 3
Commentary: Syntax Includes: NP1[agent] HARDEN NP2[patient[animate]]
NOTE: Action may be reflexive.
This trip will harden even the most experienced traveller.
He hardened himself over weeks in the mountains.
These emotional trials have hardened me.
WordNet 3.0 Sense Numbers: 4, 5