out of commission
1．retired from active military service退役；不再执行任务
When the war was over，many warships were placed out of commission．战争结束后，许多战舰都退役了。
2．not in use or working不能使用；损坏
Some of the bridges were out of commission．有一些桥梁不能使用
She had to go to school on foot because her bike was out of commission．因为自行车坏了，她只得步行去学校。