1. to convert coded information into ordinary language
2. to figure out the meaning of something that is difficult to understand

Examples

• The spy needed to decode the secret message quickly.
• Scientists are working to decode the human genome.
• She tried to decode his confusing email.
• The computer can decode encrypted files in seconds.
• Children learn to decode written words when they read.
• The archaeologist decoded the ancient symbols on the stone.
• It took hours to decode the damaged audio recording.