1
general::
Phrase(s): bare-bones
Cliché limited; stripped down; lacking refinements or extras. • This one is the bare-bones model. It has no accessories at all.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
The mere essentials or plain, unadorned framework of something, as in This outline gives just the bare bones of the story; details will come later. This phrase transfers the naked skeleton of a body to figurative use. [c. 1900]
American Heritage Idioms