Select the most appropriate meaning of the following idiom.

To walk on air

To be very happy

The most appropriate meaning of the idiom "to walk on air" is to be very happy.

It means to feel extremely happy or excited, as if you are floating on air. The idiom is often used to describe someone who has just achieved something great or who is feeling very positive about the future.

The other options are not correct.

• To be very rich: This does not mean to be very happy.
• To feel very depressed: This does not mean to be very happy.
• To be completely free: This does not mean to be very happy.