sideline Meaning, Definition & Usage

1. noun a line that marks the side boundary of a playing field
   out of bounds.
   
2. noun an auxiliary line of merchandise
   
3. noun an auxiliary activity
   spare-time activity; by-line; avocation; pursuit; hobby.
   
4. verb remove from the center of activity or attention; place into an inferior position
   
   • The outspoken cabinet member was sidelined by the President

WordNet