Meaning of the word "on top of that" in English

What does "on top of that" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

on top of that

US /ɒn tɒp əv ðæt/
UK /ɒn tɒp əv ðæt/

Phrase

in addition to that; besides

Example:
The food was terrible, and on top of that, the service was slow.
I had a long day at work, and on top of that, I missed my bus.