1) you've got to grow a backbone if you don't want to become the one who gets trampled over in the end
"1) having guts or balls  2)the "behind the scenes" guy(s) of an outfit or group who do a signficant contribution to something but don't get as much recognition
"1) you've got to grow a backbone if you don't want to become the one who gets trampled over in the end" What is the definition of "backbone"?