To look or stare angrily or sullenly. See Synonyms at frown. (verb-intransitive)
An angry or sullen look or stare. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "glower" in a sentence
"The expression could best be described as a glower."
"Setting his hand to the hilt of his sword, he cast the boy the kind of glower intended to help him make the right decision in short order."
"She regarded the overdressed girl with aversion, answered her mincingly-spoken "How do you do, Marjory?" very curtly, and continued to "glower," as Mrs. Smylie described it, without saying another word."