What does "get on with" mean?
'Get on with something' means to start or keep doing something. In this case, when Baloo says 'get on with it', he's meaning that they should hurry up and retaliate the snake who almost killed Mowgli. 'Get on with something' is normally used with things associated with work. Ex: Stop looking at your phone and get on with it. Ex: Stop talking and get on with it.