stick one's neck out - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Make oneself vulnerable, take a risk, as in I'm going to stick my neck out and ask for a raise. This expression probably alludes to a chicken extending its neck before being slaughtered. [Colloquial; early 1900s]