noun, noun or participle which takes 'suru'
falling off a bicycle or motorcycle while riding; crash in a race
Used especially in competitive cycling or motorsports contexts, but can apply to any fall from a two-wheeled vehicle while in motion.
レース中に落車して、選手は救急車で運ばれた。
The rider fell off during the race and was taken away by ambulance.
雨の日
Please be very careful about falling off your bike on rainy days.