cannon
noun [ C ] uk/ˈkæn.ən/ us/ˈkæn.ən/ cannons or cannon
（旧时的）大炮，火炮，加农炮
a large, powerful gun, usually attached to two or four wheels, that was used in the past to fire heavy stone or metal balls
（飞机上的）机关枪
a gun fastened to an aircraft
cannon
verb [ I usually + adv/prep ] UK uk/ˈkæn.ən/ us/ˈkæn.ən/
突然撞上，碰撞
to knock or hit against someone or something suddenly and forcefully as you are running
I was rushing along with my head down when I cannoned into an old lady walking the other way. 我正一路低头跑着，突然撞上了一个迎面走来的老妇人。