Besserwisser {m}; Schlauberger {m}; Schlaumeier {m}; Neunmalkluger {m} [Norddt.] [Mitteldt.]; Klugschnacker [Norddt.]; Gescheitmeier {m} [Bayr.]; Obergscheiter {m} [Ös.] - smart alec [Br.]; smart aleck [Am.]; smarty-pants; smarty; clever clogs/dick [Br.]; know-all [Br.]; know-it-all [Am.]; wise guy [Am.]; wiseacre [Am.] (old-fashioned); wisenheimer; weisenheimer [Am.] [coll.]
jemand, der überall dreinredet [pej.] - backseat driver [fig.]