harden Definition in Cambridge British English Dictionary
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Definition of "harden" - British English Dictionary

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hardenverb [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 in the desert hardened the recruits (= made them more strong and determined). As the war progressed, attitudes on both sides hardened (= became more severe and determined).
hardening
noun [U or S] uk   us   /-ɪŋ/
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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