General Antonyms:
* Silence: This is the most general antonym, meaning to not make any sound at all.
* Stay quiet: This emphasizes the act of refraining from speaking.
* Be mute: This implies an inability to speak.
* Be silent: This emphasizes the lack of sound, but can also imply withholding speech.
Antonyms in Specific Contexts:
* Write: If "speak" refers to verbal communication, "write" can be an antonym for written communication.
* Listen: If "speak" refers to expressing oneself, "listen" refers to receiving information.
* Ignore: This is an antonym if "speak" refers to communicating with someone.
* Disagree: If "speak" refers to agreeing with someone, "disagree" is the opposite.
To determine the best antonym, consider the specific context and the intended meaning of "speak."