A person who chunters or complains in a persistent, grumbling manner, particularly in British dialect.
From 'chunter' (a verb meaning to complain or mutter) plus the agent suffix '-er' (one who does the action). Related to British regional dialect.
A 'chunner' is a complainer, and the word itself—with its muttering 'ch' and nasal 'n'—sounds like complaining; English speakers unconsciously chose a word where the sound matches the meaning.
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