knife edge
noun uk/ˈnaɪf ˌedʒ/ us/ˈnaɪf ˌedʒ/
on a knife edge 处于摇摆不定的处境；处于令人焦虑的状态；结果未明
in a difficult or worrying situation of which the result is very uncertain
At the moment the election seems balanced on a knife edge. 此刻看起来，选举尚未定局。
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