Noun
The column of bones in the back which sustains and gives firmness to the frame; the spine; the vertebral or spinal column.
Anything like, or serving the purpose of, a backbone.
Firmness; moral principle; steadfastness.
Source: Webster's dictionaryTo succeed in life, you need three things: a wishbone, a backbone and a funnybone. Reba McEntire
The farmers may be the backbone of the country, but who wants to be a backbone? F. Scott Fitzgerald
He was a tool of the boss, without brains or backbone. Franz Kafka
Never grow a wishbone, daughter, where you backbone ought to be. Clementine Paddleford
It is the very backbone of wisdom not to trust too hastily. Latin Proverb
Anxiety breaks a man's backbone. Jewish Proverb