At/in the back of your mind

phrase

Something you remember or know but are not actively thinking about.

Even though he was enjoying the party, the thoughts of tomorrow's exam were at the back of his mind.

Idiomatic

Definition 1 of 2

Pro Tip 1/3

This phrase indicates a thought or memory that persistently lingers without direct focus.

She had a nagging feeling at the back of her mind that she forgot to lock the door.

Pro Tip 2/3

Use when the subject is aware of something but it's not their primary focus or concern.

Mike played video games, with the homework deadline at the back of his mind.

Pro Tip 3/3

It suggests a memory that comes to mind occasionally, not continuously active.

Old memories floated up at the back of her mind during the reunion.

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