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
Almost all of us can find something to obsess about at a restaurant.
We stew and obsess and make tiny things into giant ones.
They obsess over an occupation that should have been ended decades ago.
More than biology, their designs suggest the work of an artist left to obsess
  among tiny forms.
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