spatchcock

Short definition from Wiktionary

Noun

1. 1
   Poultry which has been cut along the spine and spread out for more even cooking.

Verb

1. 1
   To cut (poultry) along the spine and spread the halves apart for more even cooking.
2. 2
   Often followed by in or into: to interpolate or insert (something into another thing) awkwardly; to sandwich (something within another thing).