edge of the earth

bleeding edge

Something too new and untested to be reliable or to have any assurance of safety; the figurative place where such things exist.

come down to earth

To be brought back to reality; to emerge from a daydream.

cost the earth

To be a huge expense.

cutting edge

The forefront, or position of greatest advancement in some field.

edge of the world

A very remote place.

edge out

To defeat in a contest or a game by a narrow margin of victory.

go to the ends of the earth

To do everything possible to achieve something.

God's green earth

The world.