Englishfor English speakers
knock
Noun
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A sound from something hard hitting wood.
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An impact.
knock
Verb
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When you knock on something, you hit your knuckles onto it repeatedly.
She knocked on my door three times before I opened it.
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When you knock something, you hit it, often accidentally.
off
Preposition
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Away from somewhere or some time.
I got ready and by 7:00 I was off to school.
There's a nice restaurant just off the main road.
Bye, I'll be off now.
He was standing about 50m off.
Your birthday's only a few days off now.
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If something is off it is not on.
She took the hat off his head.
Keep your feet off the desk, please.
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Out of a vehicle such as a train, bus, etc.
As the train stopped, he jumped off and ran to her.
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If something that uses energy is off, it is not working.
It was dark in the room because the light was off.
He turned the TV off and went to bed.
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If you are off, you do not have to go to work or to school.
I work evenings, but I have my afternoons off.
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made smaller by a certain amount
They've taken 30% off the price.
We cut off a few pieces.
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If a plan, event, etc. is off, it will not happen.
Tonight's game is off because of the rain.
They've called off the meeting.
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If you're off something, you don't like or want something you wanted before.
That article really put me off meat.
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If you're off some medicine, you are not using it any more.
He's been off the pain killers for a few weeks.
off
Adjective
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If food is off, it is not good to eat anymore.
off
Verb
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If a person offs someone, they kill him or her.
I heard they offed Jimmy by drowning.
device
Noun
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A device is a small machine or tool.
She has a device in her kitchen for cutting garlic.
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A device is a machine or part attached to a computer, such as a keyboard, mouse, printer etc.
The mouse is an important device for using the computer.
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A device is a clever way of doing something.
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A device is a logo.