Plural of cocker; people or things that coddle or pamper, or cocker spaniels (the dog breed).
From cocker (one who coddles or indulges) + -s (plural), or from the cocker spaniel breed. The dog breed took its name from their use in hunting woodcocks, so 'cocker' refers to their original function.
Cocker spaniels are named after the birds they hunted—'cocker' comes from 'woodcock,' the game birds these dogs were bred to flush out. So when you call your pet a 'cocker spaniel,' you're actually saying 'woodcock-bird dog,' a name that's remained unchanged since medieval hunting culture.
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