Englishfor English speakers
expansion
Noun
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The act or process of expanding.
The expansion of metals and plastics in response to heat is well understood.
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A new addition.
My new office is in the expansion behind the main building.
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A product to be used with a previous product.
This expansion requires the original game-board.
arch
Noun
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A semi-circle shape, like an inverted "U".
Robert drew an arch on the paper.
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Any object having the shape of an arch, from stone bridges and doorways to bows.
They went through the arch into the church.
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A part of the foot, on the bottom, which is shaped like an arch.
She stepped on a nail and hurt the arch of her foot.
arch
Verb
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To make into the shape of an arch.
The cat arched its back.
arch
Prefix
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Arch added to the start of a word signifies it is important or the most important
An archbishop is a senior bishop.
-book villains may be an arch-enemy.