Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: , past participle of obsidere 'to besiege'

obsess

verb
     
ob‧sess
1 [transitive usually passive] if something or someone obsesses you, you think or worry about them all the time and you cannot think about anything else - used to show disapproval
be obsessed by/with something/somebody
A lot of young girls are obsessed by their weight.
Jody's been obsessed with some lifeguard for months.
2

be obsessing about/over something/somebody

informal to think about something or someone much more than is necessary or sensible:
Stop obsessing about your hair. It's fine.
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