Englishfor English speakers
beside
Preposition
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If mathx/math is beside mathy/math, it is close to mathy/math, but not in front or behind.
The book is beside the table.
engine
Noun
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An engine is the part of a machine which gives it power.
cab
Noun
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A cab is a car that you can hire (pay for) for single trips. (Often taxi cab)