A substance for reducing friction in this way, as oil or grease.
A substance, such as grease or oil, that reduces friction when applied as a surface coating to moving parts.
A slippery liquid, gel, or oil that is used to reduce friction on or soreness of body tissue.
One that facilitates conversation or cooperation.
Saw coffee as a social lubricant.
Reducing friction by providing a smooth film as a covering over parts that move against each other; lubricating.