0 If a colour or dirty mark washes out, or if you wash it out, it disappears when you wash it. -- 洗掉,洗净(颜色或污迹)
1 If an event or sports competition is washed out, it is prevented from happening or stopped early because of heavy rain. -- (因雨)取消,中止(体育比赛等)
The men's tennis semifinals were washed out this morning. 今天上午的男子网球半决赛因雨被迫取消。