verb · to lose effectiveness or cease to function as intended, often referring to a system, policy, or biological sense

由于市场环境的变化，旧的经济政策已经完全失灵。

verb · to be out of order or fail to respond correctly, typically referring to a machine, instrument, or mechanical part

飞机的自动驾驶系统在飞行途中突然失灵了。