Going Backward in Numbers, 5, 4, 3, 2, 1
This page is the CodyCross answer for the clue below from Architectural Styles, Group 1163, Puzzle 5 (Flying Buttress).
Question is: Going Backward in Numbers, 5, 4, 3, 2, 1
and the answer is: COUNTDOWN
Word Meaning:
COUNTDOWN — (astronautics) A count backward in fixed units to the time of some event, especially the launch of a space vehicle.
Definitions from Wiktionary.