to destroy an aircraft or make an aircraft, bird, etc. fall to the ground by shooting at it

He was killed during the war when his plane was shot down. 战争期间他的飞机被击落，他因此丧生。

to shoot and usually kill someone, showing no sympathy

I saw Leonforte shoot him down like a dog in the street. 我看见利昂福特在大街上把他击毙，就像打死一只狗一样。