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English definition of “harden”

harden

verb [I/T]  /ˈhɑr·dən/ us  

harden verb [I/T] (MAKE SEVERE)

to make or become stronger or more severe: [I] As the war progressed, attitudes on both sides hardened.

harden verb [I/T] (BECOME SOLID)

to become firm or solid, or to cause something to become firm or solid: [I] In a few hours the cement will harden.
(Definition of harden from the Cambridge Academic Content Dictionary © Cambridge University Press)
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