IPA: /ˈtæɡər/
KK: /ˈtæɡər/
A person or thing that marks or labels something, often used in games or to describe someone who creates graffiti.
The tagger quickly ran away after leaving his mark on the wall.
Tagger → The word is formed from "tag" (from Middle English *taggen*, meaning to attach or fasten) and "-er" (meaning a person who). A tagger is a person who attaches or fastens tags, often used in the context of labeling or marking.
Think of someone who 'attaches' ('tag') something to another thing, and the '-er' just means a person. A tagger is someone who attaches tags.