to apply some oily or greasy substance to (a machine, parts of a mechanism, etc.) in order to diminish friction; oil or grease (something).

to make slippery or smooth; apply a lubricant to

to lubricate one's hands with a lotion.

to smooth over, as a difficulty or human relationship; ease

to lubricate the friction between enemies.

Slang . to provide with intoxicating drinks.

Slang . to bribe.

to act as a lubricant.

to apply a lubricant to something.

Slang . to drink or become drunk.