run-on sentence

noun

1. a written sequence of two or more main clauses that are not separated by a period or semicolon or joined by a conjunction.

run-on sentence

1. A grammatically faulty sentence in which two or more main or independent clauses are joined without a word to connect them or a punctuation mark to separate them: “The fog was thick he could not find his way home.” The error can be corrected by adding a conjunction with a comma (“The fog was thick, and he could not find his way home”) or by separating the two clauses with a semicolon (“The fog was thick; he could not find his way home”).

Word History and Origins

Origin of run-on sentence¹

First recorded in 1910–15

Example Sentences

They used proper punctuation and even emoji, but Fred Farmer had been known for using his phone’s talk-to-text feature and frequently sending long, run-on sentences.

From Washington Post