The story
Probably popularised by its occurrence in Mark Twain's The Adventures of Tom Sawyer (1876; see quotation).
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A response to being greeted with "hello". Full definition →
Probably popularised by its occurrence in Mark Twain's The Adventures of Tom Sawyer (1876; see quotation).
Etymology from Wiktionary, CC BY-SA 4.0.