Meaning of “harden” in the English Dictionary

"harden" in American English

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hardenverb [ I/T ]

us /ˈhɑr·dən/

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)

"harden" in Business English

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hardenverb [ I ]

uk /ˈhɑːdən/ us UK FINANCE, STOCK MARKET

if prices or share prices harden, they increase:

If the oil price hardens this week and remains high, there will be some effect on fuel prices by the end of this week.
The pharmaceuticals company hardened 33p at £26.07 on speculation of predatory interest from a Swiss firm.

(Definition of “harden” from the Cambridge Business English Dictionary © Cambridge University Press)