harden
/ˈhɑɹdn̩/
Proposed by a contributor, not yet supported by evidence.
Also seen as: hardens · hardening · hardened
Sense 1
Meaning · English
To become hard.
Verb
Examples
The Chief Medical Officer of London Transport believes that public opinion against smoking will harden to the point of a total bar on the Underground, as in other countries.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Sense 2
Meaning · English
To make something hard or harder.
Verb
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Common questions
What does “harden” mean?
To become hard.
Is “harden” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.