tightrope walk

Short definition from Wiktionary

Noun

1. 1
   An instance of walking on a tightrope.
2. 2
   A perilous course between alternatives.
3. 3
   Alternative form of tightrope walk.

Verb

1. 1
   Alternative form of tightrope-walk.
2. 2
   To walk on a tightrope or on (something) as though on one.
3. 3
   To take a perilous course between alternatives.