expression, godan verb (-ru)
weigh on one's mind; worry one; be concerned about
Describes something that bothers or preoccupies you, often without a clear reason. The subject is the thing that causes worry, and the person is marked by に.
彼の言葉が気にかかる。
His words weigh on my mind.
最近、仕事のこと
Lately, I can't sleep because work is on my mind.