Compounds of 橋

• あぶない橋を渡る
  (exp) to tread on thin ice (lit: to cross a dangerous bridge)
  to go out on a limb
  to walk a tightrope
  to take risks
• 石橋を叩いて渡る
  (exp) being excessively cautious (lit: knocking on a strong stone bridge before crossing it)