轄
カツ, くさび
control, wedge
JLPT1 G7 S17 F1771
As per 害# (cut) + 車 vehicle → linchpin (compare 舝 as described in 桀) cutting rotation of a wheel, allowing *control* of the vehicle's speed → *supervision*. For the connection between cutting and control, compare 乂.
[Full Kanji Etymology List]