What is "lift wall"

Lift \Lift\, n.

1. Act of lifting; also, that which is lifted.

2. The space or distance through which anything is lifted; as, a long lift.
   --Bacon.

3. Help; assistance, as by lifting. Hence: A ride in a vehicle, given by the vehicle's owner to another person as a favor -- usually in ``give a lift'' or ``got a lift''; as, to give one a lift in a wagon; Jack gave me a lift into town. [Colloq.]

   The goat gives the fox a lift.
   --L'Estrange.

4. That by means of which a person or thing lifts or is lifted; as:

   1. A hoisting machine; an elevator; a dumb waiter.

   2. An exercising machine.

5. A rise; a degree of elevation; as, the lift of a lock in canals.

6. A lift gate. See Lift gate, below. [Prov. Eng.]

7. (Naut.) A rope leading from the masthead to the extremity of a yard below; -- used for raising or supporting the end of the yard.

8. (Mach.) One of the steps of a cone pulley.

9. (Shoemaking) A layer of leather in the heel.

10. (Horology) That portion of the vibration of a balance during which the impulse is given.
    --Saunier.

11. A brightening of the spirits; encouragement; as, the campaign workers got a lift from the President's endorsement.

    Dead lift. See under Dead.
    --Swift.

    Lift bridge, a kind of drawbridge, the movable part of which is lifted, instead of being drawn aside.

    Lift gate, a gate that is opened by lifting.

    Lift hammer. See Tilt hammer.

    Lift lock, a canal lock.

    Lift pump, a lifting pump.

    Lift tenter (Windmills), a governor for regulating the speed by adjusting the sails, or for adjusting the action of grinding machinery according to the speed.

    Lift wall (Canal Lock), the cross wall at the head of the lock.