Tra từ ground floor - Từ điển Oxford Advanced Learner 8th

ˌground ˈfloor [ground floor] BrE NAmE (BrE) (NAmE ˌfirst ˈfloor) noun
the floor of a building that is at the same level as the ground outside
•a ground-floor window
•I live on the ground floor.
Idiom: in on the ground floor
See also: ↑first floor

Synonyms:
floor
ground • land • earth
These are all words for the surface that you walk on.
floor • the surface of a room that you walk on: ▪ She was sitting on the floor watching TV.
ground • (often the ground) the solid surface of the earth that you walk on: ▪ I found her lying on the ground. ◇ ▪ The rocket crashed a few seconds after it ▪ left the ground ▪.
land • the surface of the earth that is not sea: ▪ It was good to be back on ▪ dry land ▪ again. ◇ ▪ They fought both at sea and ▪ on land ▪.
earth • (often the earth) the solid surface of the world that is made of rock, soil, sand, etc: ▪ You could feel the earth shake as the truck came closer.
ground, land or earth?
Ground is the normal word for the solid surface that you walk on when you are not in a building or vehicle. You can use earth if you want to draw attention to the rock, soil etc. that the ground is made of. Land is only used when you want to contrast it with the sea: the land beneath our feet ◇ feel the land shake ◇ sight ground/earth ◇ travel by ground/earth
on/under the floor/ground/earth
bare floor/ground/earth
to drop/fall to the floor/the ground/(the) earth
to reach the floor/the ground/land