a flat metal tumbler in a lever lock
a glass with a flat bottom but no handle or stem; originally had a round bottom
a gymnast who performs rolls and somersaults and twists etc.
pigeon that executes backward somersaults in flight or on the ground
a movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown
a rigid bar pivoted about a fulcrum
to move or force, especially in an effort to get something open
a simple machine that gives a mechanical advantage when given a fulcrum