easy as ABC/pie/falling off a log
easy as pie
Also, easy as falling or rolling off a log . Capable of being accomplished with no difficulty, as in This crossword puzzle is easy as pie. The first term presumably alludes to consuming pie (since making pie requires both effort and expertise). The variants most likely allude to standing on a log that is moving downstream, a feat in which falling off is a lot easier than remaining upright. Mark Twain had it in A Connecticut Yankee in King Arthur's Court (1889): "I could do it as easy as rolling off a log." The first colloquial term dates from the early 1900s, the colloquial variants from the 1830s. For a synonym, see piece of cake.
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.
easy as falling off a log
If something is as easy as falling off a log, it is very easy to do. She's just the sort of woman who could cook a four-course dinner for 12 while singing all of Fauré's Requiem, and making it look as easy as falling off a log. Note: You can also say that something is as simple as falling off a log or like falling off a log. All you have to do it climb up the rope and stand on the bar. Honestly, it's like falling off a log.
easy as pie
oreasy as ABC
If something is easy as pie or easy as ABC, it is very easy to do. Note: In the first idiom below, ABC is pronounced `a b c', as if you are spelling it out. With technology the way it is, it's as easy as pie to work from remote locations. With our guide, planning your US fly-drive holiday will be as easy as ABC. Compare with a piece of cake. Note: The reference is probably to eating a pie rather than making one.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
easy as falling off a log
very easy. informalThis expression was originally a mid 19th-century American one, but it is now in general use. It was used around the year 1880 by Mark Twain in the alternative form rolling off a log .
easy as pie
very easy. informalPie as a metaphor for something pleasant was originally late 19th-century US slang. Compare with nice as pie and pie in the sky (at pie).
Farlex Partner Idioms Dictionary © Farlex 2017
(as) ˌeasy as ABˈC/ˈpie/falling off a ˈlog
(informal) very easy: Try using the new photocopier. It’s as easy as pie.Farlex Partner Idioms Dictionary © Farlex 2017
easy as pie
Informal Capable of being accomplished or done with no difficulty.
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.
easy as pie
Not difficult; requiring little or no effort or expertise. The analogy no doubt is to eating pie rather than making it, which requires both effort and expertise. An American term dating from the early twentieth century, it became a cliché relatively recently. See also duck soup; easy as rolling off a log; piece of cake.
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer