marker

ot noun

1. A felt-tipped pen. Susie used a marker to write her name on the wall.
2. Marks of ink left by this type of pen. Susie has gotten marker all over the walls, and it looks dreadful.
3. A nonmonetary debt owed to someone, especially in return for a favor. We may not be able to do this alone. Maybe it’s time to call in some of our markers.
4. An object used to mark a location.

fe’l verb

1. To mark or write on (something) using a marker