tight‧rope /ˈtaɪt-rəʊp $ -roʊp/ noun [countable]

1. a rope or wire high above the ground that someone walks along in a circus

2. walk a tightrope to be in a difficult situation in which something bad could happen if you make a mistake:
I feel as though I’m walking a tightrope between success and failure.

[TahlilGaran] Dictionary of Contemporary English ▲