letter-swapcode
nounUK /ˈletə swɒp kəʊd/
US /ˈletər swɑːp koʊd/
A secret code where you trade one letter for another to hide a message.
We used a letter-swapcode to write our club's secret meeting time.
RELATED WORDS
OTHER MEANINGS
2. A fun puzzle where each letter stands for a different letter.
The newspaper's letter-swapcode took me an hour to solve.
3. A way to write notes so only friends can read them.
She passed me a letter-swapcode note during class.
4. A game where players guess which letter replaces which.
At the party, we played a letter-swapcode game with silly words.