The phrase "a single fly" is correct and usable in written English.
It can be used when referring to one individual fly, often in contexts related to nature, biology, or metaphorical expressions.
Example: "In the quiet room, a single fly buzzed around, distracting everyone from their work."
Alternatives: "one fly" or "a lone fly".
Terrified that flies were spreading it, whole households hunted down a single fly before it could infect a sleeping child.
Next to me, my backpack was stuffed with a pair of chest waders, a fly reel, a map and a single fly box filled with streamers and wet flies.
In HIGH COUNTRY FALL (Mysterious Press/Warner, $24), the 10th book in a series on which not a single fly has settled, those arts seem to run to tourist-baiting, backstabbing and real estate fiddles.
This is how a consortium of opponents, including Shiva, characterized the issue in a position paper titled "Reckless Driving: Gene Drives and the End of Nature": Imagine that by releasing a single fly into the wild you could genetically alter all the flies on the planet — causing them all to turn yellow, carry a toxin, or go extinct.
Hence Transmission Electron Microscopy (TEM) was used as an efficient tool to study the microstructure, shape and surface texture of a single fly ash particle.
for DNA extraction of a single fly.
On his profile, Mr. James describes himself as a "single, fly-by-night kind of guy" whose hobbies are politics and sports.
Nobody handed out a single flyer or flashed out a Twitter feed or gave us something to take home and remind us what we were there for.
In the world of pro wrestling, half the battle (at least) is in the bellicose talk that occurs before a single flying leg drop is delivered.
But United and Continental will continue to fly as separate carriers until they are granted a single flying certificate from federal authorities, which they expect by the end of next year.
"There's not a single flying car educational program in the world, not even remotely.
