ZWIEBACK Meaning of ZWIEBACK in English [ 'zwi:bak , 'tsvi:bak ]■ noun N. Amer. a rusk or biscuit made by baking a small loaf and then toasting slices until they are dry and crisp.OriginGerman, lit. 'twice baked'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004