What is the meaning of Clean_and_jerk?

The act of lifting the barbell from the floor to a resting position across the front of the shoulders (the clean phase), pausing, and thrusting the barbell over the head to a stationary position in one movement (the jerk phase). The normal technique for both parts of this act involves propelling the barbell upwards, quickly lowering the torso, and then straightening the legs.

To lift and manipulate a weight in this fashion.

Source: wiktionary.org