English
mansplain
Blend of man + explain, equivalent to man + -splain.
Proto-Germanic *mann- ‘human being, person, man’
Proto-West Germanic *mann ‘person’
Old English mann ‘human being, person, man’
Middle English man
English man
Latin plānus ‘level, plain’
Latin plānō ‘to flatten’
Latin explānō ‘to make plain, explain’
Old French explaner
Middle English explanen
English explain
Today it means
verb To explain (something) condescendingly (to a female listener), especially to explain something the listener already knows, presuming that she has an inferior understanding of it merely because she is female.
Language periods are conventional ranges, not dates for this word.
Etymograph / mansplain