A person or tool that applies chalk, such as a pool player who chalks their cue stick, or a device that dispenses chalk for writing.
From 'chalk' + '-er' (one who does something), following English agent noun formation patterns.
The term 'chalker' carries different meanings depending on context—it might refer to a billiards player maintaining their cue, a carpenter marking lines, or even a bird (the jackdaw) that resembles chalk in appearance.
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