oiled

An oiled machine or surface has some kind of lubricant applied to make things run smoothly.

When we talk about something being oiled, it usually means that it's been given some sort of liquid to help reduce friction and keep it working well. For example, you might see a mechanic add oil to your car's engine to prevent overheating and wear down the moving parts. On a bike or other machinery, you'll often see oil or lubricant applied to key parts like gears or axles to keep them running smoothly. It's also common for people to use oil on surfaces that they need to slide or glide over, like when working with wood or metal in a workshop.