What is the meaning of Sibilate?

To hiss.

To speak with a hissing sound.

past participle of sibilar

inflection of sibilare:

1. second-person plural present indicative
2. second-person plural imperative

second-person plural present indicative

second-person plural imperative

feminine plural of sibilato

second-person plural present active imperative of sībilō

Source: wiktionary.org