This is the 518th most frequent Russian word.
границы
Borders; boundaries; limits.
'Границы' in this sentence is used metaphorically to refer to limits or extents of one's capabilities.
Каждый человек со временем расширяет границы своих возможностей.
Each person expands the limits of their abilities over time.
In this example, 'границы' means personal boundaries or limits set by individuals for themselves.
Необходимо уважать личные границы других людей.
It is important to respect other people's personal boundaries.
Here, 'границы' refers to geographical boundaries between nations.