piekeren (ww):
arrovellarsi(en) to dwell upon moodily and at length., covare(en) to dwell upon moodily and at length., preoccupare(en) to chafe or irritate; to worry., preoccuparsi(en) to chafe or irritate; to worry., rimuginare(en) to dwell upon moodily and at length.
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Via: Memodata.com