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English to English noun
| 1 |
a fricative sound (especially as an expression of disapproval) |  | Example: the performers could not be heard over the hissing of the audience
source: wordnet30
| 2 |
The process of washing ore, or of uncovering mineral veins, by a heavy discharge of water from a reservoir; flushing; -- also called booming. | | source: webster1913
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