This is the 2143rd most frequent Polish word.
planują
"Planują" means "they plan" in English.
The word "planują" is used as a verb in present tense meaning "they are planning," showing the subject's action of making plans.
Oni planują wakacje nad morzem.
They are planning a vacation by the sea.
The word "planują" is part of a subordinate clause and is used as a verb to inquire about ongoing planning actions of the subject.
Czy wiesz, co oni planują zrobić w weekend?
Do you know what they are planning to do over the weekend?
"Planują" is used as a verb indicating the activity of creating plans, emphasizing the subject's intention of preparation.