preposition ' of '

[Unregistered]

What does 'of' mean in the following setence?
*She was a little frightened at the thought of her husband taking such a long journey.

Thanks in advance.

[svartnik]

What does 'of' mean in the following setence?
*She was a little frightened at the thought of her husband taking such a long journey.

Thanks in advance.

I would say "of" has a grammatical function and nothing more.

It introduces the object of the prepositional phrase "her husband taking such a long journey," which modifies (her) thought.