Englishfor English speakers
main
Adjective
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The main thing is the most important or biggest one.
They turned off the main road and saw a small house.
There are many problems, but the main one is money.
what was the main reason for war in Europe in 1914?
main
Noun
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A main is a large pipe or wire that carries gas, water, electricity, etc.
A break in a water main has closed the road.
cab
Noun
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A cab is a car that you can hire (pay for) for single trips. (Often taxi cab)