expression
moreover; besides; in addition; on top of that; to make matters worse
A set phrase used to add another item, often with a negative or emphatic nuance. Can be used in both neutral and complaining contexts.
彼は遅刻した。かてて加えて、宿題も忘れた。
He was late. Moreover, he forgot his homework.
雨が降ってきた。かてて加えて、風も強くなってきた。
It started raining. On top of that, the wind picked up.