Englishfor English speakers
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.
lock
Noun
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A lock is a metal thing on a door (or on a window, drawer, etc.) that stops people from opening the door unless they have the right key to open it.
No one will take things from my house. I have a very strong lock on the door.
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A lock is two or more gates (doors) in water to let boats move from lower water to higher water or the other way.
lock
Verb
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Someone locks a door when they close the lock with a key so that no one can come in.
Remember to lock the door when you leave the house.