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Origin and history of obsess

obsess(v.)

c. 1500, "to besiege" (a sense now obsolete), from Latin obsessus, past participle of obsidere "watch closely; besiege, occupy; stay, remain, abide" literally "sit opposite to," from ob "against" (see ob-) + sedere "to sit" (from PIE root *sed- (1) "to sit").

In reference to evil spirits, "to haunt," from 1530s. The psychological sense of "to haunt as a fixed idea" developed gradually from 1880s and emerged 20c. The 1895 Century Dictionary has only the two senses "besiege" (marked obsolete) and "to attack, vex, or plague from without." Related: Obsessed; obsessing.

Entries linking to obsess

mid-15c., obcessed, "tormented, obsessed," past-participle adjective from obsess. Originally especially "possessed" by a devil or fiend.

1510s, "action of besieging" (a sense now obsolete), from French obsession and directly from Latin obsessionem (nominative obsessio) "siege, blockade, a blocking up," noun of action from past-participle stem of obsidere "to besiege" (see obsess). Later (c. 1600), "hostile action of an evil spirit" (like possession but without the spirit actually inhabiting the body). Transferred sense of "action of anything which engrosses the mind" is from 1670s. Psychological sense "idea or image that intrudes on the mind of a person against his will" is from 1901.

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