Englishfor English speakers
step
Verb
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When you step, you move one foot.
When you walk, you step many times.
If you step on the ant, it will be dead.
step
Noun
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A step is a movement of the foot
Take one step forward to win the game.
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A step is one of several actions or processes taken to achieve a goal.
Heating the oven is one step needed to bake bread.
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A step is a surface used to walk upwards. Most often there are several steps, one above the other.
One must walk up the steps to get to the top of the building.
index
Noun
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An index is an alphabetical (A to Z) list, usually at the back of a book, where you can find the pages in a book that talk about particular things or words.
Look in the index to see where they talk about Chomsky.
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An index shows the level of prices, wages, etc. so you can compare them with those of an earlier date.
On Wall Street, the Dow Jones index closed 10 points up at 2,731.23.
index
Verb
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If you index something, you make an index (guide) for it.
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If you index something to a certain price level, you make it go up or down with that level.