v.
Pronunciation: ə b- ' ses, äb-
Function: verb
Etymology: Latin obsessus, past participle of obsid ē re to frequent, besiege, from ob- against + sed ē re to sit ― more at OB- , SIT
Date: 1531
transitive verb : to haunt or excessively preoccupy the mind of <was obsess ed with the idea>
intransitive verb : to engage in obsessive thinking : become obsessed with an idea