erhärten

er- +‎ härten.

• IPA^(key): [ʔɛʁˈhɛʁtn̩]

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• Hyphenation: er‧här‧ten

erhärten (weak, third-person singular present erhärtet, past tense erhärtete, past participle erhärtet, auxiliary haben or sein)

1. to harden
2. to affirm, corroborate, substantiate
3. to petrify

When used transitively, the perfect auxiliary is haben; when used intransitively, it is sein.

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• “erhärten” in Duden online
• “erhärten” in Digitales Wörterbuch der deutschen Sprache