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rainbow `noun` [ ˈreɪnbəʊ ]

• an arch of colours visible in the sky, caused by the refraction and dispersion of the sun's light by rain or other water droplets in the atmosphere. The colours of the rainbow are generally said to be red, orange, yellow, green, blue, indigo, and violet.

• "all the colours of the rainbow"

Origin: Old English regnboga (see rain, bow1).

at the end of the rainbow

• used to refer to something much sought after but impossible to attain.
"the long-lost loving parent who waits at the end of every unhappy child's rainbow"

chase rainbows

• pursue an illusory goal.
"I couldn't afford to waste petrol chasing rainbows as far as Leeds and back"

rainbow noun [ ˈreɪnbəʊ ]

at the end of the rainbow

chase rainbows

rainbow `noun` [ ˈreɪnbəʊ ]