A glossy silk; a corruption of the French word lustrine (from lustre).
To speak in lutestring.
Flash, highly-polished oratory. The expression was first used in Junius. Shakespeare has “taffeta phrases and silken terms precise.”
We call inflated speech “fustian” (q.v.) or “bombast” (q.v.); say a man talks stuff; term a book or speech made up of other
men's brains, shoddy (q.v.); sailors call telling a story “spinning a yarn,” etc. etc.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894