Expressions (phrases, clauses, etc.), Godan verb with 'ru' ending
to tread on thin ice; to go out on a limb; to walk a tightrope; to take risks; to cross a dangerous bridge
Idiomatic expression
その探偵はずいぶん危ない橋を渡ってきた。The detective has a lot of adventures.
Also written あぶない橋を渡る【あぶないはしをわたる】