knife-edge /ˈnaɪfˌɛʤ/ noun Learner's definition of KNIFE-EDGE
[singular]
: something that is very narrow or sharp锋利的东西;狭窄的东西
on a/the knife-edge
: in a dangerous or important situation in which two very different results are possible处于危急关头;处于重要时刻;处于摇摆不定的状态 -
a region resting on a knife-edge after several wars几场战争后处于存亡关头的地区
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The election results hung on a knife-edge.选举结果还很难预料。
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living on the knife-edge of poverty生活在贫困线边缘