razor-edge
Definitions
The thin, sharp edge of a blade.
A precarious or critical situation or position.
A state of extreme tension or sensitivity.
Examples
The climber balanced precariously on the razor-edge of the mountain ridge.
The negotiations were held on a razor-edge, with both sides threatening to walk away at any moment.
He lived his life on a razor-edge, constantly taking risks that others would avoid.
Synonyms
precarious perilous knife-edge critical unstable delicate tense