Regular, predictable, and uninteresting; pro forma (1710+)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with cut and dried
Ready-made, predetermined and not changeable. For example, The procedure is not quite cut and dried—there's definitely room for improvisation. This expression originally alluded to herbs for sale in a shop, as opposed to fresh, growing herbs.
[ c. 1900