This is the 2547th most frequent Russian word.
сборная
"Сборная" means "national team" or "combined team."
Here, 'сборная' is used as an adjective related to 'команда', meaning 'national' or 'representative' team.
Сборная команда России победила в чемпионате.
The Russian national team won the championship.
In this case, 'сборная' describes furniture that comes in parts to be assembled later.
Мы заказали сборную мебель для нашей гостиной.
We ordered assembled furniture for our living room.
Again, 'сборной' relates to a 'team' and is used in its adjective form referring to a representative sport team.