Something whose name one does not want to mention, but which is known to the person to whom one is speaking
you know what
Turkish pronunciation
yu nō hwʌt
Pronunciation
/ˈyo͞o ˈnō ˈhwət/ /ˈjuː ˈnoʊ ˈhwʌt/
Etymology
[ 'yü, y& also y ] (pronoun.) before 12th century. Middle English, from Old English Eow, dat. & accus. of gE you; akin to Old High German iu, dative of ir you, Sanskrit yuyam you.