mausern

From the noun Mauser (“moulting of feathers”).

• IPA^(key): /ˈmaʊ̯.zərn/, [ˈmaʊ̯.zɐn]

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mausern (weak, third-person singular present mausert, past tense mauserte, past participle gemausert, auxiliary haben)

1. (reflexive) to moult feathers

   Alle Vögel müssen sich mausern, um alte Federn zu beseitigen

   All birds need to moult to get rid of old feathers

2. (figurative, reflexive) to change positively, improve; turn over a new leaf

   Sie hat sich in den letzen Monden sehr gemausert

   She has improved a lot in the last months

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• häuten (“to moult skin”)

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