横よこ一いっ線せん

noun which may take the genitive case particle 'no'

abreast; side-by-side; in a row

Describes people or things lined up horizontally, often used adverbially as 横一線に.

• 選せん手しゅたちが横よこ一いっ線せんに並ならんでスタートを待まった。

  The athletes lined up abreast and waited for the start.

noun which may take the genitive case particle 'no'

neck and neck; almost equal

Used in competitive contexts where participants are very close in performance or ranking.

• 両りょうチームは横よこ一いっ線せんの戦たたかいを繰くり広ひろげている。

  The two teams are fighting neck and neck.