在线词典投石问路原指夜间潜入某处前,先投以石子,看看有无反应,借以探测情况。后用以比喻进行试探。拼音tóu shí wèn lù解释原指夜间潜入某处前,先投以石子,看看有无反应,借以探测情况。后用以比喻进行试探。英文释义lit. to toss a stone to find out what's ahead (idiom); fig. to test the waters