BE UP TO SOMETHING

{v. phr.}, {informal} 1. To feel strong enough or knowledgeable enough to accomplish a certain task. * /Are you up to climbing all the way to the 37th floor?/ * /Are we up to meeting the delegation from Moscow and speaking Russian to them?/ 2. Tendency to do something mischievous. * /I'm afraid Jack is up to one of his old tricks again./