Definition of cold back:
(n) :
Used other than figuratively or idiomatically: see cold, back.
(adj) :
Alternative form of cold-back. [(of a horse) Refusing to bear weight on its back; bucking and shying when anything is put on the back.]
(n) :
Alternative form of cold-back. [A syndrome in which a horse refuses to accept anything on its back (often a symptom of chronic lower back soreness)]