Wiktionary
left back
n. (context soccer English) A defender who normally plays on the left side of the field.
Usage examples of "left back".
I've no friends left back there, and, to all intents and purposes, I'm dead.
They weren't like the faces of the soldiers he had left back along the border.
Throg on the rampage, or that hound we left back in the mountains.
With a body left back in Poodle Springs, they have to figure the law will snoop for them in the end.
Most jobs had to be financed with mortgages on the ship and ground-based prior salvage in the yards left back home.