「Do nothing else and often ~.」 Said with a feeling of criticism.
例:
1. 祖父は最近怒ってばかりいる
My grandfather has been constantly angry lately.
2. 二十歳のころは遊んでばかりいた。勉強しなかったことを今は残念に思っている。When I was twenty I spent all my time playing. I now regret not studying.
3. ただ見てばかりいないで、少しは手伝ってくださいよ。Don't just stand there watching; please help a little.