The warning came none too soon, for a gust of wind hit the biplane and all but made it "turn turtle," as the saying goes.
Her tail rose, and she started, with dreadful deliberateness, to turn turtle.
Many times the boat buried her rail and deck, but she did not turn turtle.
His boat would "turn turtle" or be cut in two by the craft behind.
Almost every man aboard was thrown to the deck, and the vessel heeled over to starboard until it seemed she must turn turtle.
Herein lay real danger, for if the deck-load of ashes grew too heavy the Bear might turn turtle.
For the yellow car made a sudden swerve and seemed about to turn turtle.
If they went down in that the touring car would most likely turn turtle, and they might all be killed.
Pointed ladders are the best for tall trees and less liable to injure the tree or turn turtle and upset the picker.
Then I got alarmed, thinking the machine might turn turtle on me, so I shut off the engine, intending to glide to earth.
reptile, c.1600, "marine tortoise," from French tortue "turtle, tortoise," of unknown origin. The English word is perhaps a sailors' mauling of the French one, influenced by the similar sounding turtle (n.2). Later extended to land tortoises; sea-turtle is attested from 1610s. Turtleneck "close-fitting collar" is recorded from 1895.
"turtledove," Old English turtle, dissimilation of Latin turtur "turtledove," a reduplicated form imitative of the bird's call. Graceful, harmonious and affectionate to its mate, hence a term of endearment in Middle English. Turtledove is attested from c.1300.
To turn upside down; capsize: in the heavier puffs, they thought she would turn turtle
[1860+; fr earlier turn the turtle, found by 1818, referring to making a turtle helpless by turning it on its back]