Select the most appropriate meaning of the given idiom.

Chase rainbows

To pursue unrealistic goals

The most appropriate meaning of the idiom "chase rainbows" is to pursue unrealistic goals.

This idiom is used to describe someone who is trying to achieve something that is impossible or highly unlikely. It is often used to express disapproval of someone who is wasting their time and effort on something that is not attainable. For example, you might say "He's chasing rainbows if he thinks he's going to win the lottery." This means that you do not think he has a chance of winning the lottery.

The other options are not as accurate descriptions of the meaning of the idiom.

• To be unprepared for something: This idiom is more accurately described as "to be caught off guard."
• To lose one's patience: This idiom is more accurately described as "to become frustrated."
• To judge someone: This idiom is more accurately described as "to form an opinion about someone without knowing them well."