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English definition of “harden”

harden

verb [I or T] uk   /ˈhɑː.dən/ us    /ˈhɑːr-/

harden verb [I or T] (SOLID)

to become or make hard: The mixture hardens as it cools. It is thought that high cholesterol levels in the blood can harden the arteries (= make them thicker and stiffer, causing disease).

harden verb [I or T] (SEVERE)

to become more severe, determined, or unpleasant: Living rough in the desert hardened the recruits a lot (= made them stronger). As the war progressed, attitudes on both sides hardened (= became more severe and determined).
hardening
noun [U or S] uk   /-ɪŋ/ us  
There has been a hardening of government policy since the invasion.
(Definition of harden from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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