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marker (A2)

noun

Pronunciation: /ˈmɑːrkər/

A pen or chalk used for writing or drawing on a surface, especially a whiteboard or blackboard.

Please use a blue marker so we can easily distinguish it from the original text.
The artist sketched the initial design with a thick black marker.
He accidentally left the marker cap off, and it dried out.

marker for (prepositional phrase): Used to indicate the purpose or target of the marker. — "This symbol serves as a marker for the beginning of the trail."
marker pen (collocation): A pen designed for marking surfaces. — "She bought a pack of colorful marker pens for her art project."