1. converted (a coded message) into ordinary language
Usage: past tense and past participle of decode
2. figured out the meaning of something that was difficult to understand
Usage: past tense and past participle of decode

Examples

• The spy decoded the secret message using a special cipher.
• Scientists decoded the DNA sequence to understand the genetic information.
• She decoded the ancient symbols carved into the stone tablet.
• The computer program decoded the encrypted file in seconds.
• Researchers decoded the bird’s complex song patterns.
• He decoded her subtle hints about wanting to leave the party.
• The team decoded the radio signals from deep space.