●up to sth1. ( up to doing sth) physically or mentally capable of sth能胜任；有能力做◆She didn’t feel up to going to work today. 她不舒服，今天不能去上班。◆At my age, I just don’t think I’m up to climbing 200 steps. 在我这个年纪，真是没法爬200级台阶。◆He’s just not up to the job, I’m afraid. 恐怕他无法胜任这份工作。2. (spoken) doing sth, especially sth bad正在干，从事着（尤指坏事）◆What’s she up to? 她在捣什么鬼？◆We used to get up to all sorts of things when we were that age. 我们在那么大的时候，常常搞各种各样的恶作剧。