Sentence:  [T]he "grubit" bombs went rolling back and forth over our feet, fetching up against the sides of the car with a crash. The big Red Guard, whose name was Vladimir Nicolaievitch, plied me with questions about America ... while we held on to each other and danced amid the <WSD>caroming</WSD> bombs. 
Meaning of the word marked with <WSD> tags:  To strike and bounce back; to strike (something) and rebound.