Preoccupy (verb)

1. To occupy the attention, thoughts or feelings of someone excessively.
2. To be excessively focused or worried about something.

Origin:

From the french préoccuper, from pré- ("before") + occuper ("to occup.y")

Examples:

1. His work preoccupied him so much that he neglected his family.
2. Her appearance preoccupied her so much that she was always anxious.
3. The company's profits preoccupied them so much that they neglected their social responsibilities.
4. His conspiracy theories preoccupied him so much that it was difficult for him to trust others.
5. The government's national security preoccupied them so much that they restricted civil liberties.