
Harden
Physical Change
Used to describe a visible change from soft or liquid to solid.

Leave the chocolate outside and it will harden.
Metaphorical Use
Sometimes used to talk about ideas or feelings taking a fixed form.

Her tentative plans finally hardened into a clear itinerary.
Gradual Process
Describes a process that happens over time, not instantly.

If you wait overnight, the glue will harden.
Compare with
ConsolidateFortifyPetrifySetSolidifyStiffenStrengthenToughen
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