Second-year classroom, mock exam, nothing moving but pencils.
A teacher's hand closes over a folded slip of paper taped inside a pencil case.
"カンニングですね."
Translated literally, that sentence makes no sense at all — "that's cunning, isn't it" doesn't describe the student. In Japanese, it doesn't have to. It's already the name of the crime.
カンニングする means, simply, to cheat on a test: copying off a neighbour, sneaking in a folded カンニングペーパー (often shortened to カンペ), writing formulas on your palm, or these days checking a smartwatch. The word covers the entire genre of exam dishonesty and nothing else. You cannot use it for a cunning business deal or a cunning fox — for those, Japanese reaches for ずる賢い (zurugashikoi) or 悪知恵 (warujie), and leaves カンニング alone with its one job.
This is textbook wasei-eigo, and a slightly embarrassing one, because the slip is traceable. English cunning is an adjective — sly, crafty, cleverly deceptive. It has never meant the act of copying answers; the correct English word is cheating, or in old-fashioned schoolyard slang, cribbing. The leading theory, repeated across Japanese etymology sites, is that Meiji-era students studying English picked up cunning meaning "sly" and stretched it, sometime in the late 1800s, to cover the slyest thing they personally had occasion to do: get away with something during a test. Nobody formally coined it. A generation of students just kept using it that way until it stuck.
There is a strange kind of justice buried in that slip, though. Cunning wasn't always English's word for foxes and con men. It comes from the Middle English cunnen, "to know" — the same Germanic root that gave English can, ken, and the archaic couth still hiding, negated, inside uncouth. For centuries a cunning man wasn't sly, he was simply knowledgeable, skilled — someone who kunned things. The "sly deceiver" sense is the newer one, grafted on once "knowing more than you should" started sounding suspicious rather than admirable. Japan happened to borrow the word at the point in its life when it meant deception. But one layer down, a word for exam cheating landing on a root that literally means "to know" turns out, by pure accident, to be exactly the right word for the crime: having knowledge in a room where you agreed not to use it.
It lands hard here because of what exams are in Japan. A teenager's entire trajectory — which university, which company track, arguably which life — can turn on a single sitting once a year, and that pressure has produced not petty cheating but genuinely elaborate cases. One incident in 2011 made national news: a university entrance-exam candidate was caught relaying exam questions out by smartphone to be answered live on Yahoo! Chiebukuro, Japan's version of Yahoo Answers, while the test was still running. Proctors now patrol exam halls watching hands, sleeves and shoe cuffs the way airport security watches carry-on bags, precisely because カンニング has had a century and a half to get creative.
English kept "cunning" vague — it can describe a fox, a plan, a smile, almost anything with a hint of slyness, and it never had to specialise. Japan took the same word and gave it exactly one job: not slyness in general, but the specific, high-stakes act of using knowledge in a room where you promised not to. The word didn't get dumbed down on its way into Japanese. It got promoted — from a vague personality trait into the name of one very particular crime, complete with its own vocabulary built around it (カンニングペーパー, カンペ). English still uses cunning to compliment a chess move. Japan uses it exclusively to end someone's exam early.