be/mean the world to somebody

be the world to (one)

To be ardently loved by or exceptionally important to one. My little daughter is the world to me—I would do absolutely anything for her. Our cats are the world to my boyfriend—he's completely obsessed with them!
See also: world

mean the world to (someone)

1. To be ardently loved by or exceptionally important to someone. My little daughter means the world to me—I would do absolutely anything for her. Our cats mean the world to my boyfriend—he's completely obsessed with them!
2. To be something for which someone is deeply grateful or appreciative. Thank you so much for taking care of my kids when I was in the hospital. It really means the world to me!
See also: mean, world
Farlex Dictionary of Idioms.

be/mean (ˌall) the ˈworld to somebody

be very important to somebody; be loved very much by somebody: Her job means the world to her. They’ve only got one child and he’s all the world to them.
See also: mean, somebody, world
Farlex Partner Idioms Dictionary
See also:
  • be the world to (one)
  • mean the world to (someone)
  • think (someone) hung the moon and the stars
  • a whale of a
  • happy mean
  • bigger they are, the harder they fall
  • bigger they come, the harder they fall, the
  • the bigger they are, the harder they fall
  • the bigger they come, the harder they fall
  • the bigger they come/are, the harder they fall