A History of Short Words

From the New York Times Crossword Puzzle

HALO

Mon, 18 Oct '21
Angel's overhead?
Tue, 5 Oct '21
Sign of sainthood
Sat, 18 Sep '21
Cause of lightheadedness?
Sat, 31 Jul '21
Ring up?
Sun, 6 Jun '21
___ Top (low-cal ice cream brand)