To drown out, erase, or obliterate something (a sound, voice, trace, etc.) so it becomes inaudible or disappears.
会場の大きな歓声が彼の言葉をかき消した。
The loud cheering in the venue drowned out his words.
雪で足跡がかき消され、誰が通ったかわからなくなった。
The footprints were erased by the snow, and it became impossible to tell who had passed.
彼女は不快な記憶を時間がかき消すことを願っている。
She hopes time will erase those unpleasant memories.