A male bird that bids or calls out, or historically, a male domestic fowl; also a type of valve or faucet in plumbing.
From 'bid' (to offer sound, call out) + 'cock' (rooster or valve mechanism). The term likely developed from observing roosters' calling behavior, later applied to mechanical devices that control water flow.
The word 'cock' in plumbing comes from the same place as the rooster—medieval plumbers literally shaped water valves to look like a rooster's head, so the beak controlled the flow!
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