Englishfor English speakers
back
Preposition
—
Toward the rear.
He went back behind the stands.
—
To a place again.
I didn't like it, so I sent it back.
He went back to the same house.
They came back again.
back
Noun
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The back is the rear part of something; it is the part in the other direction from the front.
I went to the back of the house.
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The back is the rear part of the human body.
He had a scar on his back.
back
Verb
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If you back something, you support it.
The Republicans backed the bill.
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If you back up, you move backward.
He put the car in gear and backed right into the garage door.
hub
Noun
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A hub is the middle part of a wheel.
—
A hub is a place where a large amount of traffic meets or passes through.
London's Heathrow Airport is a big air traffic hub in Europe.
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A hub is a simple networking device that sends all of the data (packets) that it gets to all of the other devices that are connected to it.
Mark bought a cheap hub to connect his home computers together.