harden

1. (intransitive) To become hard.intransitive

2. (transitive, ergative) To make something hard or harder.ergativetransitive

3. (transitive, figurative) To strengthen.Examples: "In view of the system's relatively low cost, the preferred alternative could be for the military user to avail himself of multiple base stations rather than seeking to harden the base station hardware for defense applications."; "Ramos had locked Salah’s right arm and turned him, judo-style, as they lost balance going for the same ball. Television replays hardened the suspicion it was a calculated move on Ramos’s part and, when Salah landed with a hell of a thud, the damage was considerable."figurativelytransitive

4. (transitive, computing) To modify (a website or other system) to make it resistant to malicious attacks.transitive

5. (ambitransitive) To become or make (a person or thing) resistant or less sensitive.Examples: "When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand: but I will harden his heart, that he shall not let the people go."Synonyms: inureambitransitive

6. (intransitive, informal) To get an erection.Examples: "He hardened as he imagined himself running his hands over her small breasts"informalintransitive