[uh b-ses] /əbˈsɛs/

verb (used with object)
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)
to think about something unceasingly or persistently; dwell upon something.
(transitive; when passive, foll by with or by) to preoccupy completely; haunt
(intransitive; usually foll by on or over) to worry neurotically or obsessively; brood

c.1500, “to besiege,” from Latin obsessus, past participle of obsidere “watch closely; besiege, occupy; stay, remain, abide” literally “sit opposite to,” from ob “against” (see ob-) + sedere “sit” (see sedentary). Of evil spirits, “to haunt,” from 1530s. Psychological sense is 20c. Related: Obsessed; obsessing.


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