IPA: /ˈhɑːrdən/
KK: /ˈhɑrdən/
To become firm or solid, often as a result of cooling or drying.
The clay will harden as it dries in the sun.
Past: hardened
Past Participle: hardened
To make something hard or more difficult to break or damage.
The cold weather will harden the ground, making it tough to dig.
Past: hardened
Past Participle: hardened
Harden → It is formed from "hard" (from Old English "heard", meaning solid or firm) and "-en" (a suffix used to form verbs indicating to make or become). The word "harden" means to make something solid or firm.
Think of making something 'solid' ('hard') — the '-en' means to make it so. This helps you remember that 'harden' means to make something solid.