沿 (Kanji for run parallel to)

BOOBOO: This doesn't mean parallel lines, which are 平行(へいこう).

Onyomi

EN	I ENJOY walking on the road parallel to the river.

The mouths of eight thirsty people are lined up in parallel on the water's edge.

( に ) そ*う	run parallel to, like a trail parallel to the edge of a lake, or a line of houses running alongside the train tracks. ★★☆☆☆
( xxxに ) そ＊って ( YYY )	(a more figurative idiom): in accordance with XXX, we will do YYY. NP ★☆☆☆☆

	Meaning	Hint	Radical
浴	bathe	PEAKED ROOF
沿	run parallel to	NO ROOF

So you bathe under a PEAKED ROOF for privacy.

Outdoors (i.e. where there is NO ROOF), you run parallel to the river.