high-wire act
A risky job or operation, as in The university press is not allowed to either make or lose money—that's a high-wire act. This expression alludes to the aerialist performing on a tightrope stretched high above the ground. [Colloquial; mid-1900s]
Words nearby high-wire act
high-toned,
high-top,
high-up,
high-voltage,
high-water mark,
high-wire act,
high-wrought,
highball,
highbinder,
highborn,
highboy