Englishfor English speakers
auf den Fersen sein
auf
noun
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(obsolete) A changeling or elf child; a child left by fairies.
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(obsolete) A deformed or foolish child; a simpleton; an oaf.
den
Noun
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A den is a place where a wild animal lives.
The wolf went back to his den to sleep after a day of hunting.
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A den is a small cave in the side of a hill.