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Related to long face: long face syndrome
A discontented or sullen facial expression.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a disappointed, solemn, or miserable facial expression
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an unhappy or gloomy expression.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
long facen to pull a long face → fare il muso (lungo)
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995