殺し屋

(1)a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed; "his assassins were hunted down like animals"; "assassinators of kings and emperors"

(2)不意の攻撃によって殺し、しばしば、行為を行うために雇われた殺人者（特に著名な政治家を殺す人）

(3)a professional killer

(4)プロの殺し屋