stand (there) with (one's) bare face hanging out

stand (there) with (one's) bare face hanging out

To stand rooted in place with a helpless, doltish look upon one's face. Well, don't just stand there with your bare face hanging out—do something! I expected the sheriff to intervene, but he just stood there with his bare face hanging out.
See also: bare, face, hanging, out, stand
Farlex Dictionary of Idioms.

stand there with one’s bare face hanging out

in. to stand someplace looking helpless and stupid. Say something. Don’t just stand there with your bare face hanging out.
See also: bare, face, hanging, out, stand, there
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • (one's) face is like thunder
  • his, her, etc. face is like thunder
  • put (one's) face on
  • put face on
  • put on (one's) face
  • put one's face on
  • in face
  • in someone’s face
  • in someone's face
  • in your face