1To lose strength or momentum; to dwindle in energy or enthusiasm.
最初の盛り上がりが収まって、会場の雰囲気が萎えた。
The initial excitement died down and the atmosphere in the venue waned.
人気が出た商品でも、時間とともに関心が萎えることがある。
Even popular products can lose interest over time.
支持は徐々に萎えていった。
Support gradually waned.
2To wilt or droop (of plants); to wither.
水をやらないと花が萎えてしまう。
If you don't water them, the flowers will wilt.
夏の強い日差しで葉が萎えている。
The leaves are wilting from the strong summer sun.
3Colloquial: to feel demotivated, lose interest, or be put off (often used when disappointed or turned off).
告白して断られて、完全に萎えた。
I confessed and was rejected — I was totally demotivated.
そんな冷たい態度だと、誰でも萎えるよ。
With that cold attitude, anyone would be discouraged.
冗談が寒くて、場が萎えた。
The joke was lame and it killed the mood.