To keep a record or memorandum.
1888. As [the conductor] did not keep tab on the party, Maloney traveled free.Missouri Republican, Feb. 15 (Farmer).
1902. Old Joe begun to miss little dribs o cash now an then, an begun to keep tab on Jimmy, an fore the young scamp knowed it, he was ketched up with as plain as day.W. N. Harben, Abner Daniel, p. 197.
1909. It will no doubt please the members of the Legislature to know that the suffragists are keeping tab in a systematic fashion, of the votes of all members of both houses.N.Y. Evening Post, April 5.