Definition of razor's edge
—used in various phrases to refer to a dangerous position or a position in which two different things are carefully balanced He's a thrill-seeker who likes living on the razor's edge. The country's future is balanced on a razor's edge. He walks a/the razor edge between humor and bad taste in his comedy.
Seen and Heard
What made you want to look up razor's edge? Please tell us where you read or heard it (including the quote, if possible).