The phrase "trained assassin" refers to a person who has been taught and practiced killing skills, usually for secret or illegal purposes. Full definition
Unfortunately, this violence often has a flippant feel to it, especially when these highly trained assassins make jokes about the impact of their bloody careers. (parentpreviews.com)
What the hell job does he have that he gets to train young people to become trained assassins? (oracleoffilm.com)
Arm those sissy kids... and never forget that trained assassins make the best kindergarten teachers. (religion.blogs.cnn.com)