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waterworks (plural waterworks)

  1. (in the singular) the water supply system of a town etc., including reservoirs, pumps and pipes
  2. (in the singular) any single facility, such as a filtration plant, within such a system
  3. (informal, in the plural) tears
    She turned on the waterworks when we told her the old man was dead, but she was asking questions about the will soon enough.
  4. (informal, in the plural) the genitourinary system