IPA: /ʌnˈkoʊʃər/
KK: /ʌnˈkoʊʃər/
Not acceptable according to Jewish dietary laws.
Eating pork is considered unkosher in Jewish culture.
Unkosher → It is formed from "un-" (meaning not) and "kosher" (from Hebrew *kasher*, meaning fit or proper). The word "unkosher" means not fit or proper according to Jewish dietary laws.
Think of 'not' ('un-') and 'fit' or 'proper' ('kosher') to remember that 'unkosher' refers to something that is not acceptable according to those standards.