one old cat

[ wuhn-uh kat ]
/ ˈwʌn ə ˌkæt /

noun Games.

a form of baseball in which there is a home plate and one other base, and in which a player remains at bat and scores runs by hitting the ball and running to the base and back without being put out.
Also one o' cat, one-a-cat.

Origin of one old cat

An Americanism dating back to 1840–50