a long shaft with a broad blade at one end, used as a lever for rowing or otherwise propelling or steering a boat.

something resembling this or having a similar purpose.

a person who rows; oarsman.

to propel with or as if with oars; row.

to traverse or make (one's way) by, or as if by, rowing.

to row.

to move or advance as if by rowing. ?

put in one's oar

to meddle; interfere

He put in his oar and was told to mind his own business.

rest on one's oars

to cease to make an effort; relax after exertion; stop working after success or completing a task

Once he became president, he was content to rest on his oars.

noun

blade , paddle , pole , propel , row , rower , scull , spoon oar , sweep