We found one dictionary that defines the word sluice downs:

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1. sluice downs: Collins English Dictionary

(Note: See sluice_down as well.)

Definitions from WordNet (sluice down) ▸ verb:  pour as if from a sluice ▸ Also see sluice_down ▸ Words similar to sluice downs ▸ Usage examples for sluice downs ▸ Idioms related to sluice downs ▸ Wikipedia articles (New!) ▸ Words that often appear near sluice downs ▸ Rhymes of sluice downs ▸ Invented words related to sluice downs