Select the most appropriate meaning of the given idiom.

To come round

To become conscious again

The most appropriate meaning of the idiom "to come round" is to become conscious again.

The other options are incorrect.

• "To meet someone by chance" is not the same as to come round. Meeting someone by chance does not mean that the person is becoming conscious again.
• "To spend a lot of time with someone" is not the same as to come round. Spending a lot of time with someone does not mean that the person is becoming conscious again.
• "To go round and round" is not the same as to come round. Going round and round means to move in a circle, while to come round means to regain consciousness.

The idiom "to come round" comes from the idea of someone who has fainted or been unconscious coming back to consciousness. So, when someone is said to come round, it means that they are regaining consciousness. For example, you might say that someone came round after being hit by a car.