The antonym is of course an answer: an answer.
I recommend an online dictionary for you, which can be easily translated from Chinese to English, provide synonyms, antonyms and related phrases at the same time, and win the standard English pronunciation.
/dict/index.htm
However ~ ~ I feel that you won't ask such a simple question, will you?
If you ask about the English abbreviation ask, it means:
ask
Amplitude keying digital modulation technology