For option (1) the expression implies to give money, especially generously. For option (3), the expression used is 'to conceal or hold back the feeling'. For option (4), the expression implied is 'to be too dependent on each other'. For option (2) 'pocket all the lines given to you' is grammatically correct, but we pocket physical things like cash, money, etc. and not abstract quantities. Thus option (2) is incorrect usage of the term pocket.