透风 tòufēng to ventilate Origin Definitions Defs Strokes Stroke Words Sentences Sents 密不透风 mìbùtòufēng airtight hermetically sealed; tightly closed so that no air can pass through没有不透风的墙 méiyǒubùtòufēngdeqiáng no secret can be kept forever literally 'there is no wall that doesn't let the wind through'; no matter how well a secret is guarded, it will eventually be leaked