Here is the meaning of the word, OAR

Oar ( n ) - An implement for impelling a boat, being a slender piece of timber, usually ash or spruce, with a grip or handle at one end and a broad blade at the other. The part which rests in the rowlock is called the loom.
Oar ( n ) - An oarlike swimming organ of various invertebrates.
Oar ( n ) - An oarsman; a rower; as, he is a good oar.
Oar ( v. t. & i. ) - To row.