Englishfor English speakers
acid
Noun
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An acid is a liquid with a high number of hydrogen ions in it that can burn things.
Fruit often has a little acid in it.
The acid burned the table.
Acids taste sour but bases taste bitter.
acid
Adjective
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If something is acid, it is like an acid, from an acid, or acidic.
The factories nearby have made the lake more acid.
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If something has an acid taste, it is sour.
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If something said or done to you was acid, it was hurtful.
Their acid comments are painful.
refined
Adjective
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If you are refined, you are polite and well-educated.
You can find many refined people in the Louvre museum.
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.