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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.
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