Sideline

Sideline may refer to:

• Extended side, the geometric line that contains the side of a triangle
• Sideline, a secondary job that someone works part-time in addition to a job they consider their main occupation
• Sidelines, the lines that mark the outer boundaries of a sports field
• Sideline reporter, a sports broadcaster
• Sideline (app), a smartphone app
• "Sideline Ho", a 2007 song by American singer Monica