Something that is done without much or any effort, thought, or skill; a cakewalk. I've been running marathons for years now, so this 5K run will be a sleepwalk for me. I knew I wouldn't have too much trouble in the entry-level computer class, but I wasn't expecting as much of a sleepwalk as that!
See also: sleepwalk
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.