Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A storm sewer.
  • n. A catch basin.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An access point or conduit for rainwater that drains directly downstream in a (drainage) basin without going through sewers or water treatment in order to prevent or belay floods

Etymologies

An allusion to their usefulness in catching stormwater and therefore preventing floods. (Wiktionary)

Examples

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