Obsess Definition
əb-sĕs, ŏb-
obsessed, obsesses, obsessing
verb
obsessed, obsesses, obsessing
To be obsessed or preoccupied.
Webster's New World
To haunt or trouble in mind, esp. to an abnormal degree; preoccupy greatly.
Webster's New World
To have the mind excessively preoccupied with a single emotion or topic.
American Heritage
(intransitive, colloquial, construed with over) To think or talk obsessively about.
Stop obsessing over it, will you!
Wiktionary
Origin of Obsess
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From Latin obsessus, perfect passive participle of obsideō (“sit on or in, remain, besiege"), from ob (“before") + sedeō (“I sit"); see sit, session, etc.; compare assess, possess.
From Wiktionary
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Latin obsidēre obsess- to beset, occupy ob- on ob– sedēre to sit sed- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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