To not be considered or taken seriously. Theoretically or physically to be always stuck “on the bench” of life, in other words, in any situation/circumstance you are taken out as a key player.
“Even though he asked me to the movies, I sidelined that real quick.

He’s cute, but not my type.

I could never take him seriously.”
by Tealikethedrink January 4, 2022
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In sports, the people on the sideline don't get noticed, they're in the background.
Don't let the whining mollycoddle fool you, she got as much sports playing time as a kid as any other kid, her mother and father watched as many of her little league games as they did those of their male children, and she was the kind of person that liked attention so much she would try to walk over anybody she thought was weaker or more passive than her to get it. If you listened to her lies, you would think her mother and father didn't even notice her and that she had to do 10 times as much to prove she was just as worthy as a boy, when really the narrative is a means to an end, a way for her to keep getting the attention she was always accustomed to getting since birth because she was a bully (the kind that bullied due to too little discipline instead of too much). It's everyone around her that always had to prove that they were still worthy of anything once she arrived somewhere, it was everyone around her that had to prove they were not already obsolete, outdated, phased out, or useless (and ready for demolition). She was Buzz Lightyear, her mother's new flying toy. How could anyone not be obsolete when Buzz Lightyear came around? It mattered only to Buzz Lightyear who was on the sideline.
by The Original Agahnim December 16, 2021
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when you "play" a sport but never get playing playing time. Usually consist of friends who hate there coaches.
Jacob: "Coach will never give me playing time"
Mike: " Lets make the sideline squad"
by Jacobcrazy1 January 25, 2017
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The act of presenting oneself uninvitedly onto the sidelines of a crowded sports arena, while confidently and courageously avoiding any confrontation from security and/or unruly spectators. To achieve perfection in sidelining, once must present a photograph of said act as evidence that there are no signs of pursuit from the authorities.
Michael was banned from the Georgia Dome for three years after sidelining during the football game.
by Stinky September 3, 2014
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When you chill with someone famous and get the surplus dome they pass up
Yo I ended up on Charlie sheens yacht and got some sideline Einstein from his sisters friend.
by samrentch January 1, 2023
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A parent who likes to tell a child what he or she should do but is not directly involved in their everyday lives or only on occasion. The "parent" only watches and observes said child from the "side" or "sideline" but are not directly involved in their everyday life or activities.
My dad always tells me what to do and judges me without even knowing the circumstance or my day-to-day life. He's a sideline parent.

My mom always assumes that im doing something wrong when she doesn't even know me or what i do everyday. What a sideline parent..
by Big Al 56 January 17, 2018
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