on a knife-edge
US /ɒn ə naɪf-ɛdʒ/
UK /ɒn ə naɪf-ɛdʒ/
1.
in a difficult, dangerous, or uncertain situation
:
•
The negotiations were on a knife-edge for days.
•
The future of the company is currently on a knife-edge.
in a difficult, dangerous, or uncertain situation