knabbern (ww):
knabbelen(de) —.
(en) (transitive) to take a small, quick bite, or several of such bites, of (something); (intransitive) to take a small, quick bite, or several of such bites; to eat (at frequent intervals) with small, quick bites.
(ru) царапать, дробить зубами., knagen(en) to bite something persistently.
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