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
To obsess is to think about someone or something to an extreme extent.
When a book captures your mind and you cannot put it down or stop thinking about it, this is an example of a time when the book obsesses you.
When you are consumed or haunted by thoughts of your lost love, this is an example of a time when you obsess.
YourDictionary

(intransitive, colloquial, construed with over) To think or talk obsessively about.

Stop obsessing over it, will you!
Wiktionary
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Origin of Obsess

  • 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

  • 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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