have something on the brain

US /hæv ˈsʌmθɪŋ ɑn ðə breɪn/
UK /hæv ˈsʌmθɪŋ ɑn ðə breɪn/
"have something on the brain" picture
1.

頭がいっぱいである, 〜のことばかり考えている

to be unable to stop thinking or talking about something

:
He's been having something on the brain about his new project all week.
彼は一週間ずっと新しいプロジェクトのことで頭がいっぱいだ。
Ever since she got the promotion, she's had nothing but work on the brain.
昇進して以来、彼女は仕事のことばかり考えている