One of the mysteries of the English language finally explained.
1A bottle used as a trap, especially for catching insects.
2A cylindrical or bottle-shaped trap in the waste pipe from a bath, basin, or toilet, typically having a removable cap so that rubbish can be cleaned out of the system.
Mid 19th century; earliest use found in People's Magazine. From bottle + trap.
bottle trap/ˈbɒtl trap/
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