noun
parallel lines
Geometric sense: two or more lines that never intersect.
この二本の線は平行線です。
These two lines are parallel lines.
noun
remaining far apart; not reaching an agreement; views that never cross
Figurative use: describes discussions, opinions, or positions that stay separate and never converge toward agreement.
The negotiations remain at an impasse, with both sides far apart.
二人の意見は平行線をたどった。
Their opinions never met; they just stayed parallel.