[go in] vi (1812) 1: to make an approach (as in attacking)
2. a: to take part in a game or contest b: to call the opening bet in poker: stay 3 of a celestial body: to become obscured by a cloud
4: to form a union or alliance: join--often used with with "asked the rest of us to go in with them" -- go in for 1: to give support to: advocate
2: to have or show an interest in or a liking for
3: to engage in: take part in