Englishfor English speakers
nail
Noun
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A nail is a small, long, thin sharp metal thing for holding wood together. People put it into the wood by hitting it with a hammer.
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A nail is the thick, hard part at the ends of fingers and toes.
I broke the top off my finger nail and it was very painful.
nail
Verb
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If you nail something to something else, you use a nail to join them.
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When someone gets an idea just right, we say they nailed it or "hit the nail on the head".
I think you've nailed the reason why this isn't working.
back
Preposition
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Toward the rear.
He went back behind the stands.
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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.