To swell, bulge, or rise up physically; to be piled up or heaped, causing a raised surface.
地面が地盤沈下の影響で所々盛り上がっている。
The ground has risen in places due to subsidence issues.
パン生地がオーブンで盛り上がってきた。
The dough has started to rise in the oven.
熱気でカーペットが盛り上がって見えた。
The carpet looked like it was bulging from the heat.
To get excited, to liven up, or to become animated (e.g., an audience or conversation getting energized). Common in spoken Japanese.
ライブ会場がどんどん盛り上がってきた。
The concert venue kept getting more and more excited.
友達との話が盛り上がって、気づいたら夜中だった。
The conversation with my friends got so lively that before I knew it it was midnight.
最近のドラマはSNSで盛り上がっている。
The recent drama is trending and generating excitement on SNS.