Definitions
1.nounA crosspiece forming a step of a ladder; a round.
2.nounA crosspiece between legs of a chair.
3.nounA position in a hierarchy."the lowest rung of the society"
4.nounA floor timber in a ship.
5.nounOne of the stakes of a cart; a spar; a heavy staff.
6.nounOne of the radial handles projecting from the rim of a steering wheel.
7.nounOne of the pins or trundles of a lantern wheel.