As a Verb or Adjective: 1. To start to do something after either hesitating or waiting for permission to do so, or even contrary to the wishes of others. English = go ahead, proceed. 2. To suggest someone do something or to challenge someone to do something to show how brave or reckless they are. English = dare. 3. To be prepared to do something that may be difficult, dangerous, or the product of a challenge or dare. English = (be) willing. Idiomatic English (be) up for it. Interactive: 1. Used alone to mean you will accept a challenge or a dare and go ahead and do something, despite possible risks. English = “I’m willing!”, “I’ll dare to do it!” 2. Used alone to express angry disregard for others comments. English = 'I don't give a damn what you think!', 'I don't care (I'll do it anyway!'), 'So what! (I'll do it anyway!'), and so on. 3. Used alone to express anger or annoyance. English = 'Damn!', 'Damn it!', 'Blast!', and so on.