2 verb
oil2 [transitive]
1DT to put oil onto part of a machine or part of something that moves, to help it to move or work more smoothly:
The bicycle chain needs oiling.
2 to put oil or cream onto your skin, for example to protect you from the sun:
I asked Simon to oil my back for me.

oil the wheels

British English to help something to be done in business or politics successfully and easily

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