ランナー

らんなー
noun
runner
1. runner (baseball)
In baseball, a player who is on base and attempting to advance or score.
ランナーアウトなった
The runner was out.
ランナー(さん)(るい)いる。
There's a runner on third base.
2. runner (general)
A person who runs, especially in track and field or for exercise.
彼女(かのじょ)マラソンランナーだ。
She is a marathon runner.

ランナー is a loanword from English "runner," used in both sports and general contexts.

BASEBALL USAGE (SENSE 1):

  • ランナーが()る: a runner gets on base
  • ランナーを()く: to have a runner on base
  • ランナーがアウトになる: the runner is called out
  • ランナーが(はし)る: the runner runs (attempts to steal)

GENERAL USAGE (SENSE 2):

  • マラソンランナー: marathon runner
  • 市民(しみん)ランナー: citizen runner (amateur participant)
  • トップランナー: top runner (also used figuratively for a leader in a field)

CONTRAST:

  • ランナー: runner (loanword, used in sports contexts)
  • 走者(そうしゃ): runner (native Japanese term, more formal, used in sports commentary)

USAGE:
In baseball, ランナー and 走者(そうしゃ) are interchangeable, though 走者(そうしゃ) is more formal. In running/jogging contexts, ランナー is the standard term.