To pull, tug, or jerk someone or something upward. A noun or pronoun can be used between "yank" and "up." I yanked my head up to see what was going on after the alarm sounded. The officer handcuffed the suspect, yanked him up off the ground, and shoved him into the police cruiser.
yank something up
to pull or jerk something up. He yanked his pants up. He yanked up his pants and threw on his shirt.