Phrase and Word Origins
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What is the origin of "ducks in a row"??
(Etymology)
Brewer's Dictionary of Phrase and Fable, ISBN 0-06-270133-9:
An American expression meaning to have one's arrangements completed, to have things organized or lined up; or, literally, to have one's skittles set up. In an American bowling alley the skittles, or pins, are called ducks.
From the Phrase Finder Forum:
Primitive versions of modern bowling were known many centuries ago. Pins of varied sizes and shapes were employed. Eventually they were standardized at fifteen inches in both height and circumstances. Originally called ten-pins, the equipment used in Europe was employed in the earliest American bowling saloons. The game was modified by introduction of a short, slender pin that was compared with a duck and, by extension, called them duckpins. So many people reset so many pins in rows that one who completes a task is commended as having put his 'ducks in a row.'
Phrase Finder Forum
From the Forty Ducks page:
How simple it seemed. My marks were excellent. The second year, reading Caesar's Gallic wars was not. That's where "Forty Ducks in a Row" came into being. Caesar's Latin actually read, "Forte Dux in Aro" -translated to "Brave Leader in Battle". We wise guys merely visualized it the other way perhaps because it was easier to remember.
The Forty Ducks Page
From Chuck Moreland's Phrases with Origings page:
Baby ducklings swim in a straight line behind the mother duck. If the ducklings stray to far, the mother duck will get them back in line, that is get her ducks in a row.
Chuck Moreland's Phrases with Origins
Other possibilities:
As a nickname for the soldiers of the Bombay Presidency
From a children's game called "duckstones"
From an arcade game of marksmanship involving plastic ducks
From a sailor's trousers, called "ducks"
From military tents made of untwiled linen
From a tank (or similar military vehicle) formation
From the formation ducks use when flying low over water
Of these selections, we suggest that Brewer's explanation is the most plausible."