An Etymological Dictionary of the German Language/Annotated/Imbiß

Imbiß, masculine, ‘lunch,’ from Middle High German and Old High German imbī̆ȥ, inbī̆ȥ, masculine and neuter, ‘food, meal,’ allied to Middle High German enbîȥen, Old High German inbîȥan, ‘to partake of food or drink, eat,’ allied to beißen.