undercode

The English word “undercode” has 9 meanings listed here.

noun

A subtext; ideas or information that are assumed or implied but not explicitly coded.
A secret message included in another message or stream of data.
A code (which represents a datum) that is grouped with other codes into a final encoding.

To communicate using codes that do not convey the entire message, but which rely on the recipient's construction of meaning through connotation or subtexts.
To use or convey (a message) in a way that requires the recipient to construct part of the meaning.
To communicate (information) indirectly, by means of an undercode.
To encode a secret message that is masked by a surface message or stream of data.
To represent by a code that indicates a lower level of service than what was provided.
To use fewer codes than are needed to fully describe something.

From under- + code.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.