Oxford Advanced American Dictionary

Definition of oar noun from the Oxford Advanced Learner's Dictionary

oar

noun
oar pronunciation English ɔː(r) oar pronunciation American ɔːr
 
a long pole with a flat blade at one end that is used for rowing a boat
He pulled as hard as he could on the oars.We took one oar each and rowed quickly to the shore. compare paddle
Idioms

put/stick your oar in

(British English, informal) to give your opinion, advice, etc. without being asked and when it is probably not wanted
Synonym
interfere
I was getting along very nicely until Patrick stuck his oar in.