A History of Short Words

From the New York Times Crossword Puzzle

IOU

Wed, 10 Nov '21
Debtor's note
Fri, 5 Nov '21
Cabbage alternative?
Tue, 5 Oct '21
Debtor's note
Tue, 4 May '21
Debtor's letters
Sat, 9 Jan '21
Acknowledgment of a debt