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.

• put your back into
• put your back into something
• put your best foot forward
• put your cards on the table
• put your feet up
• put your finger on
• put your finger on something
• put your foot down
• put your foot in it
• put your foot to the floor
• put your hand in pocket
• put your hand in your pocket
• put your hand on heart
• put your hand on your heart
• put your head above the parapet
• put your head down
• put your head on the block
• put your heads together
• put your heart and soul into
• put your heart and soul into doing something
• put your heart and soul into something
• put your heart into
• put your heart into something
• put your house in order
• put your life in hands