first basefirst base
- the base to the left of the pitcher, the first of the four bases that a base runner attempts to reach safely
- the defensive position played by the first baseman
first base Idioms
get to first baseSlang
to accomplish the first step of an undertaking, often, specif., a romantic or sexual one
- Baseball a. The first of the bases in the infield, counterclockwise from home plate.b. The fielding position occupied by the first baseman.
- Slang The first stage or step toward completion or success: “never got to first base with any of his &ellipsis; deals” (Ross Macdonald).