This is the 3468th most frequent Japanese word.
盛り上がっ
"盛り上がっ" means "to become excited, lively, or elevated."
The word implies the event reached a peak of excitement or liveliness.
イベントは大いに盛り上がりました。
The event was greatly exciting.
Here, the word suggests the lively and engaging nature of the conversation.
会話が盛り上がっていたのでつい遅くまで続けてしまいました。
The conversation was so lively that we ended up continuing until late.
In this context, the word refers to the anticipation of becoming enthusiastic or exhilarated by tomorrow's match.