Stop wishing that something will happen without any effort on your part; instead, start working to get it done and show some determination. I don't know if you do wishbones in Russia. It's the bone of a bird at the breast, shaped like a 'Y'. Two people grab and pull either end and make a wish. The wishbone breaks and the person with the bigger piece gets their wish - at least in theory.

A wishbone is a name of a very fragile bone, shaped like the letter "Y", in some birds, for example turkeys and chickens. There is an old custom that if two people hold the opposite ends of the wishbone, each makes a wish and then they pull until the wishbone breaks, the person who ends us with the joint on their end of the bone will have their wish granted. As opposed to a wishbone, a backbone (the spine) is extremely strong and hard to break; it supports the entire frame of whatever animal, or human, we are discussing. Your sentence means "Stop wishing for things to come true, be strong, take charge and make them come true."

Ha ha ha. That is one of the funniest expressions I've heard. The wishbone is a certain bone in a chicken. Although it allows you make a wish, it is also very thin and breaks easily. I think that is the meaning here. "Get some backbone" = "Be a man, will you?" backbone = confidence; courage

Figuratively, "your backbone" means your courage and determination (ie. your ability to stand straight and tall, to face adversity). The wishbone is as Fdmaxey described it: the clavicle of a chicken, broken to make a wish. "Stop wishing and start doing!"

This quote is from "Eat, Pray, Love" by Elizabeth Gilbert. Можно интерпретировать эту тонкую, туманную и непонятную фразу как-то так: "Не сиди и мечтай, а иди и делай!"