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knife-edge
noun [usually singular]
ujung pisau yg tajam 
■ IDIOM| on a knife-edge
(a) (tt keadaan, dll.) seimbang di ujung tanduk atau dl keadaan tidak menentu
▪ The company is balanced on a knife-edge.
Perusahaan itu dl keadaan tidak menentu.
(b) (tt org) sangat khawatir/gelisah tt sst
▪ She is always on the knife-edge whenever she is with him.
Dia selalu gelisah setiap kali dia bersamanya.

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