it serves somebody rightspokenDESERVE used to say that you think someone deserves something unpleasant that happens to them, because they have been stupid or unkind 某人活该,某人罪有应得 ‘She kicked me!’ ‘It serves you right, teasing her like that.’ “她踢我!”“你活该,谁叫你这么取笑她。”
→ it serves somebody right at serve1(2)