Here are some possible interpretations, based on the meaning of "salt" in other contexts:
* "True to their word": Salt is a symbol of trust and faithfulness in some cultures. Therefore, "true to salt" might be a figurative way of saying someone is reliable and keeps their promises.
* "Hardworking and dedicated": Historically, salt was a valuable commodity, and people who worked in the salt industry were known for their hard work and dedication. Thus, "true to salt" could refer to someone who is a diligent and committed worker.
* "True to their roots": Salt is a natural element and a common ingredient. Therefore, "true to salt" could refer to someone who is genuine and authentic, staying true to their origins.
However, without more context, it's difficult to pinpoint the precise meaning of "true to salt." If you can provide more information about where you heard this phrase or what context it was used in, it may be easier to determine its intended meaning.