またがる (うまを~)
またがる (うまを~) · matagaru (umawo~) · JLPT N1 · noun
straddle
🐎 股 (mata) means thigh: to straddle is to hold your thighs across something, like a horse
The object takes を, so the horse is the thing straddled, as in 馬を跨ぐ. The root mata (また) comes from 股, the word for thigh.