Д335
HE НА ДУРАКА (ДУРУ, ПРОСТАКА) HAПАЛ
highly collsent past only
fixed WO you are (he is etc) underestimating the intelligence of the person with whom you are (he is etc) dealing ( usu. used in contexts when the interlocutor underestimates the speaker's intelligence): I'm not the fool you take me for (he's not the fool you take him for etc)
what do you take me for (what do they take her for
etc), a fool?you (he
etc) shouldn't take me (her
etc) for a fool.