obsess

[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

obsessingly, adverb
obsessor, noun

abscess, obsess.


1. possess, control, haunt.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
obsess (əbˈsɛs)
 
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
Here, as there, the adjustment necessitates the same obsessing obstinacy of
  recurrence in the memory of the patient.
Some comments, as one who's lately been obsessing about morels.
We grow our little boys to play rough and aspire to physical dominance, then
  slam them for obsessing about sports and war.
But that's not gonna stop the military from obsessing over them anyway.
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