Green’s Dictionary of Slang

1. (US Und.) to attract, to ensnare.

1879

Bismarck (ND) Trib. 19 July 4/1: In the slang of the profession, ‘he could ring in the suckers better than anybody.’.

2. (US Und.) to join, to associate with.

1897		A.H. Lewis Wolfville 128: The Plaza Paloduro could have pulled off this ’lection [...] if it ain’t for a Greaser from San Antonio who tries to ring in on us.
1904		Number 1500 Life In Sing Sing 261: I blew out and rung in with a couple of penny-weighters. A Tommy and his papa.
1928		R. Carr Rampant Age 135: Dot wants a date too. So I thought maybe you’d like to ring in on the party.

3. (US) to obtain.

1907

C. M’Govern By Bolo and Krag 34: I thought I had hit a smuggler and was determined to [...] maybe ring in for a couple of thousand pesos bounty money if I could put the Customs people wise.

4. (US) to use.

1915

Van Loan ‘The Extra Man’ in Buck Parvin 25: How the deuce can I ring in lions and elephants and camels without a jungle scenario.