"一定迟到"在英文中可以表示为"be bound to be late"或者"be sure to be late"。

"be bound to"这个短语的意思是"必定会"、"一定会"，例如：

"I'm bound to forget something on this trip." (我肯定会在这次旅行中忘记了什么东西。)

"be sure to"这个短语的意思是"一定会"、"肯定会"，例如：

"Be sure to lock the door before you leave." (出门前一定要锁门。)

下面是一些使用"be bound to be late"或者"be sure to be late"表示"一定迟到"的例句：

"I'm bound to be late for the meeting because of the heavy traffic." (因为交通拥堵，我肯定会迟到开会。)
"I'm sure to be late for the party because I have to finish this project first." (我肯定会迟到聚会，因为我必须先完成这个项目。)