This is the 93rd most frequent Persian word.
شدند
"شدند" means "they became" or "they went."
In this sentence, 'شدند' signifies the action of transitioning into a state, specifically becoming close friends.
آنها دوستان صمیمی شدند.
They became close friends.
Here, 'شدند' describes the process of undergoing a change, in this case, starting to feel tired.
بعد از جلسه خسته شدند.
They got tired after the meeting.
'شدند' in this context indicates the event of becoming lost in a place.