”a slap in the face”
an action that insults or upsets someone; an insult
رفتاری که باعث اهانت به کسی یا ناراحت شدن او شود
.Example 1: It was a real slap in the face for him when she refused to go out to dinner with him
Example 2: It was a slap in the face to be the only one not invited to the party.