a long face, to wear/draw/pull

long face

A facial expression denoting sadness, dissappointment, or dissatisfaction. Jill had such a long face yesterday after she learned that she failed her exam. Hey, kiddo, why the long face? Is something bothering you?
See also: face, long
Farlex Dictionary of Idioms.

long face

A facial expression showing sadness or disappointment, as in Greg's long face was a clear indication of his feelings. [Late 1700s]
See also: face, long
The American Heritage® Dictionary of Idioms by Christine Ammer.

a long face, to wear/draw/pull

To look sad or dissatisfied. A common expression in the nineteenth century, it no doubt came from the elongated look resulting from the mouth being drawn down at the corners and the eyes downcast.
See also: draw, long, pull, wear
The Dictionary of Clichés by Christine Ammer
See also:
  • a long face
  • a turn of phrase
  • appear to
  • (one) can whistle for it
  • a change of heart
  • a mystery to (one)
  • able to do
  • able to do it
  • a shoulder to cry on
  • a piece of the action