in plain English
In clear, straightforward language, as in The doctor's diagnosis was too technical; please tell us what he meant in plain English. [c. 1500] Also see in so many words.
The Oldest Abbreviations In EnglishIn the age of LOL, WTF, and OMG, abbreviations are often looked at as a sign of the coming apocalypse. (Spoiler: LOL, WTF, and OMG are not the oldest abbreviations in English—you're shocked, we know.)
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.