[wise.acre] n [MD wijssegger soothsayer, modif. of OHG wizzago; akin to OE witega soothsayer, witan to know] (1595): one who pretends to knowledge or cleverness; esp: smart aleck
WISEACRE
Meaning of WISEACRE in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012