To surround or encircle (something or someone), enclosing or fencing it in.
公園は高い塀に囲まれている。
The park is surrounded by a tall wall.
子どもたちが先生を囲んで質問した。
The children gathered around the teacher and asked questions.
この村は山に囲まれているので、冬は雪が多い。
This village is surrounded by mountains, so there is a lot of snow in winter.
To besiege; to surround an enemy or place in order to attack or blockade it.
城は敵軍に囲まれてしまった。
The castle was surrounded by the enemy army.
警察が建物を囲んで立ち入りを制限した。
The police surrounded the building and restricted entry.
To play board games such as go or shogi (an older/idiomatic usage meaning to gather and play).
父は毎晩近所の仲間と将棋を囲んでいる。
My father plays shogi with his neighbors every night.
休日は友達と囲碁を囲んでゆっくり過ごした。
I spent the holiday leisurely playing go with friends.