[冒昧, mào mèi, ㄇㄠˋ ㄇㄟˋ](humble expression) to take the liberty; to make bold; to presume on sb's patience; forgive my arrogance, but...#42461[Add to Longdo]
[素昧平生, sù mèi píng shēng, ㄙㄨˋ ㄇㄟˋ ㄆㄧㄥˊ ㄕㄥ]to have never met sb before (成语 saw); entirely unacquainted; a complete stranger; not to know sb from Adam#62922[Add to Longdo]