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1.
Get by = manage

When someone has to manage sth or a situation
Fuck! It's getting worse and worse, I can't get by it anymore.
by István Dergecz Neto October 31, 2007
 
2.
A Get-by is someone that you use, in order to get through a situation.
"Girl, why don't you talk to Angela anymore... you know the girl from your Biology class?"

"Maaan, she was just a get-by; there wasn't really many people to talk to in that class. What about you & them people you used to sit with at lunch?!"

"Pshtt, they was get-bys, too."
by Ali D G March 29, 2010