on (someone's) mind

if something is on someone's mind, they are thinking about it a lot or worrying about it.

Something's worrying you, isn't it? What's on your mind?

I wanted to talk about men but Helen obviously had other things on her mind.

I'm sorry if I've been a bit irritable recently but I've got a lot on my mind (= I'm worrying a lot) at the moment.

• hit man
• hit on
• hit on someone
• hit on something
• hit or miss
• hit pay dirt
• hit right between the eyes
• hit rock bottom
• hit someone between the eyes
• hit someone like a ton of bricks
• hit someone right between the eyes
• hit someone up
• hit someone where it hurts
• hit someone where it hurts most
• hit something hard
• hits the fan
• hit stride
• hit the books
• hit the bottle
• hit the brakes
• hit the brick wall
• hit the buffers
• hit the ceiling
• hit the deck
• hit the dirt