OAR

noun

1. A type of lever used to propel a boat, having a flat blade at one end and a handle at the other, and pivoted in a rowlock atop the gunwale, whereby a rower seated in the boat and pulling the handle can pass the blade through the water by repeated strokes against the water's resistance, thus moving the boat .
2. An oarsman; a rower.
3. An oar-like swimming organ of various invertebrates.

verb

1. To row; to travel with, or as if with, oars.