'splain
1 Americanverb (used with or without object)
Usage
What does -splain mean? The combining form -splain is used like a suffix meaning “to explain or comment on something in a condescending or overconfident manner.” It is occasionally used in slang terms. In most instances, the first element of the word describes the perspective of the "explainer," e.g., mansplain. The form -splain comes from the word mansplain, meaning “to explain something to a woman in a condescending, overconfident, and often inaccurate or oversimplified manner, typically to a woman already knowledgeable about the topic.” The form -splain in this sense is extracted from explain.
Etymology
Origin of 'splain
By shortening and alteration of explain
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.