a build-up of tension

Translations
нарастание напряженности
There was a build-up of tension before the meeting.
Перед встречей наблюдалось нарастание напряженности.
Definitions
A gradual increase in emotional or psychological pressure, often leading to a climax or resolution in a situation or narrative.
Words
build-up

noun
накопление
tension

noun
напряжение