Extremely discreet, meticulous, or thorough, leaving no loopholes or room for error; watertight.
他做事一向水泄不漏，所以大家都很信任他。
He always handles matters in a watertight and meticulous manner, so everyone trusts him completely.
Next Idiom
Extremely discreet, meticulous, or thorough, leaving no loopholes or room for error; watertight.