一直線|いっちょくせんitchokusen[3]nakadaka (mid-high)

1. nounstraight line
   彼かれは仕事しごとが終おわるとすぐ一直線いっちょくせんにパブへ向むかう。↗

   As soon as work is over, he makes a beeline for the pub.

• Synonym直線ちょくせんNeutralThe geometric term for a straight line, objective and technical; 「一直線」 often works adverbially, meaning straight or directly, as in 「一直線に進む」.
• Antonym曲線きょくせんNeutralAn antonym: a curved line, the usual pair to 「直線」; it contrasts with the straightness of 「一直線」.
• AntonymジグザグNeutralAn antonym: a zigzag that bends left and right repeatedly; it contrasts with 「一直線」's straight, direct advance.

Use 「一直線」 for going straight or directly ahead; 「直線」 is the geometric term. Say 「曲線」 for a curved line and 「ジグザグ」 for a path that bends back and forth.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 一いち本ぽんの直線ちょくせん。
2. 曲まがっていないさま。まっすぐ。
3. 脇目わきめもふらずに取り組とりくむさま。
4. 複雑ふくざつでなく簡素かんそなさま。