4in 
/ˈɪn/ noun
plural ins /ˈɪn/ noun [count] chiefly US, informal : a way of becoming involved in something or of influencing someone
▪ When you're trying to get started in show business, it helps to have an in. ▪ They must have an in with the boss. — see also ins and outs
▪ When you're trying to get started in show business, it helps to have an in. ▪ They must have an in with the boss. — see also ins and outs
