そのうえ
そのうえ · sonoue · JLPT N3 · conjunction
in addition
🥞 その + 上 (うえ) = that + on top: on top of that, furthermore
その means that, and うえ (上) means above or on top. Put together, そのうえ works like the English on top of that: you've said one thing, and now you add another. It's written 其の上 or その上.