A water tap or faucet with a bent-down nozzle that allows water to flow downward into a container.
From 'bib' (to drink/flow) + 'cock' (a valve or faucet). The name describes the function of allowing liquid to flow for drinking.
Bibcocks are still used in every British garden, but Americans call them something else—it's a perfect example of how two English-speaking countries developed completely different names for the same object.
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