An adverbial phrase meaning 'after a long time' or 'for the first time in a while'. Very commonly used in everyday speech.
久しぶりに友達に会って、話が弾んだ。
I met a friend after a long time and we had a lively conversation.
久しぶりに映画館で映画を見た。
I watched a movie at the cinema for the first time in a while.
久しぶりにゆっくり休めて嬉しい。
I'm glad to have a proper rest after a long time.