A History of Short Words

From the New York Times Crossword Puzzle

HMM

Fri, 28 Jan '22
"Let's see here ..."
Sat, 22 May '21
Utterance while chewing on a pencil
Tue, 23 Feb '21
"I dunno ..."
Fri, 29 Jan '21
What you might say after reading a tricky crossword clue