Definition of oil verb from the Oxford Advanced American Dictionary

 

oil

 verb
verb
NAmE//ɔɪl//
 
oil somethingVerb Forms present simple I / you / we / they oil
 
he / she / it oils
 
past simple oiled
 
-ing form oiling
 
 
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to put oil onto or into something, for example a machine, in order to protect it or make it work smoothly He oiled his bike and pumped up the tires.
See the Oxford Advanced Learner's Dictionary entry: oil