Screw
To swing the body from one side to the other during the stroke, instead of swinging straight backward and forward. If the man swings towards his oar during the stroke he is said to screw "into the boat"; if away from it "out of the boat."
Scull.-(1) An oar which is wielded by one hand, and of which there is one for each hand. (2) To use such oars.
Shank.-[See OAR.]