obsess Definition

obsess
verb obsesses, obsessed, obsessing

1. To occupy someone's thoughts or mind completely, persistently or constantly; to preoccupy or haunt.

Example: She is obsessed by football
Thesaurus: consume, possess, grip, dominate, plague, engross, preoccupy, torment, haunt, nag.
(chiefly N Amer)
intr
2. To think or worry constantly about something.

Etymology: 16c in sense 1: from Latin obsidere, obsessum to besiege, from ob- in front of + sedere to sit.