wide-awake [ -ə wāk] ′
adjective completely awake alert Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
adjective Completely awake. Alert; watchful. noun Related Forms: The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. wide-awake - Phrases/Idioms
Fully awake; also, very alert. For example,
He lay there, wide awake, unable to sleep, or She was wide awake to all the possibilities. The wide in this idiom alludes to the eyes being wide open. [Early 1800s] The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.