pent-up excitement

Translations
накопившееся волнение
There was a lot of pent-up excitement among the fans before the concert.
Среди поклонников перед концертом было много накопившегося волнения.
Definitions
A strong feeling of excitement or enthusiasm that has been held back or suppressed for a period of time, often resulting in an intense or explosive release when finally expressed.
Words
pent

adjective
сдерживаемый
up

adverb
вверх
excitement

noun
возбуждение