Englishfor English speakers
floor
Noun
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The floor is the flat part at the bottom of a room. People stand on the floor.
Don't drop your milk on the floor.
The children are sitting on the floor to play.
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A floor is a level of a building.
To get to room 302 you have to go up three floors.
of
Preposition
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Made using.
It is a house of cards.
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.