slap in the face
1．an insult；a disappointment侮辱；失望
The minister's decision was a slap in the face to those who had tried to change his mind．部长的决定等于是在那些企图使他改变主意的人的脸上打了一记耳光。
Susan thought it was a slap in the face when her boyfriend invited another girl to the dance．苏珊认为她男友邀另一女孩去跳舞对她是一种侮辱。
2．insult；embarrass；make feel bad侮辱某人；使某人不快
I don't want to slap her in the face by not coming to her party．我不想由于不参加她的晚会而使她扫兴。