harden Meaning in Cambridge Learner Dictionary
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Meaning of "harden" - Learner English Dictionary

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harden

verb [I, T]
 
 
/ˈhɑːdən/
BECOME HARD to become hard and stiff, or to make something become hard and stiff: This island is formed from volcanic lava that has hardened into rock.Hard and firmPhysically strong and powerful
STOP FEELING EMOTIONS to stop feeling emotions about someone or something, so that you seem less kind, gentle, or weak: hardened criminals Controlling emotionsCalm and relaxedNot showing or feeling emotions
(Definition of harden from the Cambridge Learners Dictionary © Cambridge University Press)
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