sibilate From WikiWord, the free dictionary English Contents DefinitionsRelated wordsReferences DefinitionsverbTo hiss.To speak with a hissing sound. Related wordsSynonymssisshisssizzhishhizzsiffilatesifflefizzlewhispersighwhirrsoughsithesqueaksirenbuzzRhymesbubble itdouble hitdouble itle billettrouble hittrouble it References Wiktionary — sibilate Wikipedia — sibilate