ob·sess

[uhb-ses]
verb (used with object)
1.
to dominate or preoccupy the thoughts, feelings, or desires of (a person); beset, trouble, or haunt persistently or abnormally: Suspicion obsessed him.
verb (used without object)
2.
to think about something unceasingly or persistently; dwell obsessively upon something.

Origin:
1495–1505; < Latin obsessus, past participle of obsidēre to occupy, frequent, besiege, equivalent to ob- ob- + -sid(ēre) combining form of sedēre to sit

ob·sess·ing·ly, adverb
ob·ses·sor, noun

abscess, obsess.


1. possess, control, haunt.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Obsess is one of our favorite verbs.
So is yaff. Does it mean:
to introduce subtleties into or argue subtly about.
to bark; yelp.
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World English Dictionary
obsess (əbˈsɛs) [Click for IPA pronunciation guide]
 
vb
1.  (tr; when passive, foll by with or by) to preoccupy completely; haunt
2.  (intr; usually foll by on or over) to worry neurotically or obsessively; brood
 
[C16: from Latin obsessus besieged, past participle of obsidēre, from ob- in front of + sedēre to sit]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

obsess
c.1500, "to besiege," from L. obsessus, pp. of obsidere "besiege, occupy," lit. "sit opposite to," from ob "against" + sedere "sit." Of evil spirits, "to haunt," is from 1530s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Almost all of us can find something to obsess about at a restaurant.
He wakes up in a hospital, unable to remember what happened, and this episode
  of amnesia begins to obsess him.
How anyone can obsess about the place beggars belief.
But that's the difference between people who obsess about fashion and people
  who obsess about food.
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