Relining refers to the process of adding a new layer to an existing lining. There are a variety of synonyms that can be used to describe this process, depending on the context in which it is being used. One common synonym for relining is refurbishing, which implies a restoration of an existing structure or item. Another synonym for relining is renovating, which suggests a more extensive overhaul or upgrade. Other synonyms for relining may include repairing, reconditioning, fixing, or replacing, depending on the specific nature of the work being done. Ultimately, the choice of synonym will depend on the desired tone and the specific context of the writing or conversation.