chase a rainbow
To pursue some goal or accomplishment that is utterly unrealistic or unlikely to happen. I know you'd love to be an actress, but instead of chasing a rainbow for the rest of your life, why not to pick a stable career and start being an adult? It feels like the government is chasing a rainbow in its efforts to overhaul the tax legislation. I though Jenn was chasing a rainbow all these years, but, wow, she is actually a published novelist now.
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