Dictionary

The interior or inner part.

Example: The inside of the building has been extensively restored.

The left-hand side of a road if one drives on the left, or right-hand side if one drives on the right.

Example: On a motorway, you should never pass another vehicle on the inside.

The side of a curved road, racetrack etc. that has the shorter arc length; the side of a racetrack nearer the interior of the course or some other point of reference.

Example: The car in front drifted wide on the bend, so I darted up the inside to take the lead.

(in the plural) The interior organs of the body, especially the guts.

Example: Eating that stuff will damage your insides.

Guts, intestines, innards