on 的反义词有under,off,out。
是指"在...上面＂,反义词应该是under，当指＂打开＂时，反义词应该是off
词组： try on ; train on ; turn on electricity ; go weaving on sth
双语例句
1.Revision: Are you available on Friday evening?
反义词是 unavailable。 你周五晚上有空吗？
2.Professor: Exactly! Winnie, the opposite of "off the air" is "on the air".
off the air的反义词是on the air, 也就是“播出”的意思。
3.On one page, Wordnik displays a word's definition, pronunciation, synonyms, antonyms, a word's etymology, and stats about how often a word was used.
Wordnik在同一页面上显示一个单词的释义、发音、同义词、反义词、词源和使用频率。