To be overjoyed; to leap for joy — a four-character idiom expressing great delight.
合格通知を受け取った彼は欣喜雀躍した。
He leapt for joy when he received the acceptance letter.
久々の優勝にチームは欣喜雀躍した。
The team was overjoyed at their first victory in a long time.
子どもたちはプレゼントを見て欣喜雀躍していた。
The children were overjoyed when they saw the presents.