摸着石头过河

1. • to wade across the river, feeling for footholds as one goes (idiom)
2. • to advance cautiously, step by step
3. • to feel one's way forward

Character by character

• 摸(mō)feel with the hand
• 着(zhe)aspect particle indicating action in progress or ongoing state
• 石(shí)surname Shi
• 头(tou)suffix for nouns
• 过(guò)cross
• 河(hé)river