comedown
/ˈkɒmɪdaʊn/Definitions
1. noun
A feeling of disappointment or depression after a period of excitement or euphoria, especially when caused by the loss of a stimulus that previously fueled it.
“The comedown after the party was brutal, and I spent the rest of the day in bed.”
2. verb
To experience a comedown, especially after a period of excitement or euphoria.
“She’s been on a rollercoaster of emotions lately, and I’m worried she’ll comedown hard when the concert is over.”