A contrivance for catching and holding animals, as a concealed pit or a clamplike device that springs shut suddenly, A device for sealing a passage against the escape of gases, especially a U-shaped or S-shaped bend in a drainpipe that prevents the return flow of sewer gas by means of a water barrier, A kind of movable ladder or steps; a ladder leading up to a loft, intransitive verb_ To gain control of (a moving soccer ball) by allowing it to hit and bounce off a part of the body other than the arm or hand, To seal off (gases) by a trap, To prevent from escaping or getting free