third base
n. Baseball
► The third of the bases on the diamond counterclockwise from home plate; the last base to be reached by a runner before home plate.
► The position played by the third baseman.

[TahlilGaran] American Dictionary ▲

third base
n. The base to be touched third in baseball.
He reached third base standing up on a long triple.

[TahlilGaran] English Idioms Dictionary ▲