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obsess

ob·sess [ əb séss, ob séss ] (past and past participle ob·sessed, present participle ob·sess·ing, 3rd person present singular ob·sess·es)


verb 
Definition:
 
1. transitive verb never stop thinking about something: to occupy somebody's thoughts constantly and exclusively
The desire for vengeance obsesses him.

2. intransitive verb be preoccupied: to think or worry about something constantly and compulsively
You can't spend your vacation obsessing about money.

[Early 16th century. < Latin obsess-, past participle of obsidere "besiege," literally "sit opposite to" < sedere "sit"]
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