A Scottish or Northern English dialect word for a cuckoo bird, or sometimes used to mean a silly or foolish person.
From Scots and Northern English dialect, likely imitative in origin (mimicking the cuckoo's call 'gauk, gauk'). Related to Old Norse 'gaukr' meaning cuckoo, showing Scandinavian influence on British dialect words.
The cuckoo bird was historically so associated with being a trickster and causing chaos (laying eggs in other birds' nests) that calling someone a 'gauk' became an insult meaning fool—animals shaped our insults in fascinating ways.
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