WordWeb Online

1. A line that marks the side boundary of a playing field
   - out of bounds
    
2. An auxiliary line of merchandise
    
3. An auxiliary activity
   - avocation, by-line, hobby, pursuit, spare-time activity

1. Remove from the centre of activity or attention; place into an inferior position
   "The outspoken cabinet member was sidelined by the President"

Derived forms: sidelines, sidelining, sidelined

Type of: break, bump, business line, demote, interest, kick downstairs, line, line of business, line of merchandise, line of products, pastime, product line, pursuit, relegate

Encyclopedia: Sideline