
Be all the world to somebody
Emotional Intensity
Suggests deep emotional connection, not just general importance.

After the rescue, the firefighter was all the world to the family.
Hyperbolic Expression
It's often used to exaggerate feelings metaphorically, not to be taken literally.

To the smitten poet, his muse was all the world to him.
Personal Importance
Shows unique personal value, rather than public or financial value.

For the lonely sailor, his ship was all the world to him.
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