high-wire

high-wire (plural high-wires)

1. A wire strung high above the ground which is used for acrobatic stunts.

high-wire

1. Pertaining to a wire strung high above the ground which is used for acrobatic stunts.
2. (by extension) Very risky and daring.
   • 2017 January 19, Peter Bradshaw, “T2 Trainspotting review – choose a sequel that doesn't disappoint”, in the Guardian‎:

     T2 isn’t as good as T1: it is a little too long and unwinds a bit into caper sentimentality, broad comedy and self-mythologising. But it has the same punchy energy, the same defiant pessimism, and there’s nothing around like it. This sequel was a high-wire act, but Boyle has made it to the other side.