expression, noun
on the right track; on the right lines
Used to say that someone's idea, guess, or approach is roughly correct or heading in the right direction. Often appears in the patterns いい線(を)いく or いい線(を)いってる.
See also: いい線いってる
彼の考えはいい線いってると思う。
I think his idea is on the right track.
その答え、いい線いってるけど、もう少し詳しく説明して。
That answer is on the right lines, but explain it in a bit more detail.
A common inflected form meaning 'is on the right track'; essentially the same expression in its typical progressive usage.
Combination of いい (good) and 線 (line), literally 'a good line'. The figurative sense of being on the right track likely derives from the idea of drawing a line that is close to the correct one.