Final answer:
The idiom 'cogs spinning in your head' is a metaphorical expression that means someone is deep in thought or actively processing information in their mind.
Step-by-step explanation:
The idiom 'cogs spinning in your head' is a metaphorical expression that means someone is deep in thought or actively processing information in their mind. It suggests that the person's mind is working hard, just like the spinning cogs in a machine. This idiom is often used to describe someone who is trying to solve a complex problem or make a decision.
For example, if you are studying for a difficult math exam, you might say that you have cogs spinning in your head as you try to understand and remember all the concepts.
So, when someone mentions 'cogs spinning in your head', they are referring to the mental process of thinking, analyzing, and problem-solving.