WordWeb Online

1. The act of following someone secretly
   - tailing

1. Follow, usually without the person's knowledge
   "The police are shadowing her"
    
2. Cast a shadow over
   - shade, shade off
    
3. Make appear small by comparison
   "This year's debt shadows that of last year";
   - overshadow, dwarf

Derived forms: shadowings

Type of: chase, command, darken, dominate, follow, following, overlook, overtop, pursual, pursuit

Encyclopedia: Shadowing