baserunner

Noun

(baseball, softball) A player who is on base and is thus trying to advance to the next base.

Japanese Meaning

野球またはソフトボールにおいて、塁に出塁した選手で、次の塁へ進むことを目指す選手

With two outs, the baserunner sprinted toward third as the outfielders tried to throw him out.

二アウトで、塁上の走者は外野手が彼を刺そうとする中、三塁へ向かって全力で走った。

Sense（1）

(baseball, softball) A player who is on base and is thus trying to advance to the next base.

baserunners

（ plural ）