This is the 10962nd most frequent Russian word.
выступят
"Выступят" means "will perform" or "will speak."
Here, "выступят" suggests that the actors will perform or present their roles in a theatrical production.
В новом спектакле актёры выступят в главных ролях.
In the new play, the actors will perform in the main roles.
In this context, "выступят" refers to the athletes presenting their abilities or performances during a sports competition.
Спортсмены выступят завтра на чемпионате.
The athletes will compete tomorrow at the championship.
Here, "выступят" means that the scientists will present or speak at the conference.