[adjective] - (of food or places where food is sold etc.) prepared or kept in conditions that follow the rules of Jewish law, or (figurative informal humorous) lawful, able to be trusted and therefore goodkosher food/meata kosher restaurant/butcher/shop(figurative) Their business activities aren't quite kosher.
KOSHER
Meaning of KOSHER in English
Cambridge English vocab. Кембриджский английский словарь. 2012