It's a figurative expression that suggests someone is ignoring the negative aspects of a situation and focusing solely on the positive, often to the point of being unrealistic or naive.
Here's why it's called "rose-colored glasses":
* Rose-colored glasses create a rosy, warm hue, making things appear more pleasant than they actually are.
* Wearing rose-colored glasses metaphorically means viewing the world through a filter that enhances the positive and minimizes the negative.
Example:
"You need to pack your rose-colored glasses and face reality. This relationship isn't going to work out."
In essence, the phrase suggests that someone needs to be more realistic and acknowledge the negative aspects of a situation.