Englishfor English speakers
rainbow
Noun
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A rainbow is an arch of colors in the sky that you can see in the rain when the sun is at your back.
Traditionally, the colors of the rainbow are red, orange, yellow, green, blue, indigo and violet, but in real life, it's actually a continuous spectrum.
rainbow
Adjective
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When something is rainbow, it is made up of many colors.
of
Preposition
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Made using.
It is a house of cards.
oil
Noun
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Oil is a liquid that is burned to create heat or used in machines to make them run well.
Gas and oil are essential to running a car.
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Oil is a liquid made of fat that is used for cooking.
Cook the potatoes in oil.
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An oil is a painting made of oil paint.
oil
Verb
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If you oil something, you put clear oil on a machine to make it run well.
She oiled the parts of the gun.