straight line
彼(かれ)は仕事が終わるとすぐ一直線にパブへ向かう。
As soon as work is over, he makes a beeline for the pub.
one, one radical (no.1)
イチ / ひと-
straightaway, honesty, frankness, fix, repair
チョク / ただ.ちに
line, track
セン / すじ