1. world
1.1. worldwide
1.1.1. def: global, universal
1.1.1.1. ex: mc donald's is a worldwide enterprise
1.2. all time in the world
1.2.1. def: a lot of time
1.2.1.1. ex: I have finished my studies. I have all time in the world now.
1.3. out of this world
1.3.1. def: amazing, unbelievable
1.3.1.1. ex: the show was out of this world
1.4. to think the world
1.4.1. def: to hold something or someone in very high esteem
1.4.1.1. ex: She thinks the world of her adviser
1.5. top of the world
1.5.1. def: extremely happy
1.5.1.1. ex: I am in the top of the world because I won the lotery!
2. ground
2.1. to get on the ground
2.1.1. def: to be realistic
2.1.1.1. ex: now, with your baby, you have to keep your feet on the ground
2.2. to be grounded
2.2.1. def: very sad
2.2.1.1. ex: I am grounded about killing animals
2.3. off the ground
2.3.1. def: start something
2.3.1.1. ex: The play never got off the ground
3. earth
3.1. earth-shattering
3.1.1. def:sufficiently significant to affect the whole world
3.1.1.1. ex: it need not be earth-shattering.but it should be somenthing that mattered greatly to you
3.2. cost the earth
3.2.1. def: very expensive
3.2.1.1. ex: this dress cost the earth
3.3. on earth
3.3.1. def: in the world
3.3.1.1. ex: What on earth is he doing with a spade?
4. floor
4.1. floorboards
4.1.1. def: any of the boards composing a floor
4.1.1.1. ex: the floorboards of my house are very old
4.2. ocean floor
4.2.1. def: the subterranean part of the sea
4.2.1.1. ex: the ocean floor looks like mountains
4.3. dance floor
4.3.1. def: a place for to dance
4.3.1.1. ex: we want to have a dance floor in our house