rut
轑 centers on a wheel track or groove worn into a surface: a rut. The meaning is narrow and concrete, with no clear abstract extensions.
轑 combines 車 (vehicle, wheel) with 尞, which likely contributes the sound. The exact historical development of 尞 is uncertain, but the compound suggests a wheel-related concept.
A cart 車 with a burning 尞 (suggested by the fire-related shape) wheel grinding a deep rut into the road.
For ロウ, imagine a low cart wheel stuck in a rut: low -> ロウ, and the rut keeps the wheel low.