This is the 5745th most frequent Polish word.
wystartują
"They will start" or "They will take off."
In this sentence, 'wystartują' is used to indicate the future action of taking off, specifically referring to airplanes.
Samoloty wystartują za godzinę.
The airplanes will take off in an hour.
Here, 'wystartują' describes the start of participation or commencement of an event, in this case, a marathon.
Zawodnicy wystartują w maratonie o ósmej rano.
The athletes will start the marathon at eight in the morning.
In this example, 'wystartują' is employed metaphorically to describe initiating or launching a project or activity in the future.