Meaning "to experience something for the first time":
* See the world: To travel widely and experience different cultures.
* A whole new world: A completely different and exciting experience.
Meaning "to have a significant impact":
* Change the world: To make a major positive difference in the world.
* Shake the world: To cause great upheaval or change.
* Turn the world upside down: To completely change the existing order of things.
Meaning "to be very important or significant":
* The end of the world: A catastrophic event or situation.
* The world is your oyster: You have many opportunities and possibilities.
* The whole world knows: Something is widely known or publicized.
Meaning "to be very excited or enthusiastic":
* My world is falling apart: To be in a state of great distress.
* The world is my oyster: To feel limitless possibilities.
* A world of difference: A significant and noticeable difference.
Meaning "to be very busy or occupied":
* A world of trouble: A lot of problems or difficulties.
* A world away: A great distance, both physically and emotionally.
* Out of this world: Extraordinary or exceptional.
Meaning "to be very small or insignificant":
* Not worth a dime in the world: To be completely worthless.
* A world of good: To have a very positive impact.
* A world of difference: A very significant difference.
These are just a few examples, and there are many other idioms that use the word "world."