To syphers means to figure out a secret code or message without the key or the code.
When someone syphers something, it means they are very smart and good at solving puzzles.
Examples:
She tries to syphers the secret message.
He syphers the code and finds the hidden treasure.
The detective syphers the mysterious note.
The kids try to syphers the riddle, but they can't.
He can syphers any puzzle in the world.
She syphers the secret code and saves the day.