tight ‧ rope /ˈtaɪt-rəʊp $ -roʊp/ BrE AmE 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.