“自首并告密”可以翻译为 “surrender oneself and inform on others” 或 “turn oneself in and spill the beans (about others)” 。
“surrender oneself and inform on others” 是较为正式、书面的表达， “surrender oneself” 意思是“自首” ，“inform on others” 表示“告发、告密他人”。
“turn oneself in and spill the beans (about others)” 中 “turn oneself in” 也是“自首”的意思， “spill the beans” 是比较口语化的表达，意为“泄露秘密、告密” 。