English dictionary siss meaning and definition Definition and meaning of siss at MeaningMonkey.org. siss meaning and definition in the English Dictionary. SISS verbDefinition of siss (verb)express or utter with a hisssynonyms: hiss, sibilate, sizzmake a sharp hissing sound, as if to show disapprovalsynonyms: hiss, sibilate, sizz Source: Princeton University Wordnet
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