A person or tool used for chinking, particularly someone who fills the gaps between logs in log cabin construction with sealing material.
From 'chink' (to fill) plus '-er' agent suffix. The term emerged in American frontier contexts where log-cabin construction was essential.
On American colonial frontiers, a skilled chinker was almost as important as a carpenter—bad chinking meant frozen cabins and potential death in winter, so this was a specialized and valued skill.
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