To wrinkle or contract the brow as an expression of anger or disapproval. See Synonyms at frown.
To express with a frowning facial expression.
A look of anger or frowning disapproval.
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.