Sideline

Sideline(s) may refer to:

• Extended side, the geometric line that contains the side of a polygon
• Sidelines, the lines that mark the outer boundaries of a sports field
• Sideline (app), a smartphone app
• Sidelines (newspaper), the student newspaper of Middle Tennessee State University
• Sideline, a side road in the concession road system of Upper and Lower Canada
• Side Line, a 1987 album by Onyanko Club
• "Sidelines", a 2022 song by Phoebe Bridgers
• Side job - an additional job in order to supplement income