n. any of various large usu. voracious marine fish with a long body and prominent dorsal fin.
Etymology: 16th c.: orig. unkn.
2.
n. colloq. a person who unscrupulously exploits or swindles others.
Etymology: 16th c.: orig. perh. f. G Schurke worthless rogue: infl. by SHARK(1)
Useful english dictionary. 2012.