This is the 17226th most frequent Russian word.
строят
"Строят" means "they build" or "are building" in English.
In this sentence, 'строят' is used in the present tense referring to an ongoing construction of the house by 'они' (they).
Они строят новый дом.
They are building a new house.
Here, 'строят' describes the children engaging in a creative activity by assembling shapes, demonstrating that the verb can also mean 'to assemble' or 'to construct'.
Когда дети играют с конструктором, они строят различные фигуры.
When children play with a construction set, they build various shapes.
In this example, 'строят' is used metaphorically, indicating the formation or planning process by companies.