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Use "sibilous" in a sentence
"The words dropped from her lips in a sibilous crescendo as her blood drove her to a display of emotion."
"These two birds are so characteristic of the meadows in southwestern counties that a summer evening seems silent to me without the "crake, crake!" of the one and the singular sibilous rattle of the other."
"A little yellow bird (it is either a species of the _alauda trivialis_, or rather perhaps of the _motacilla trochilus_) still continues to make a sibilous shivering noise in the tops of tall woods."