you should wear pads and a helmet when mountain biking, as even the most experienced biker is bound to eat shit from time to time
to have an accident resulting in contact with the ground at speed, while riding a human-powered vehicle such as a bicycle or skateboard
"you should wear pads and a helmet when mountain biking, as even the most experienced biker is bound to eat shit from time to time" What is the definition of "eat shit"?