Not closely connected; a remote conceit; as, “a far-fetched simile,” a “far-fetched allusion.” Also, obtained from a foreign or distant country, “quod rarum est, carum est.”
“The passionfor long, involved sentences ... and far-fetched conceits ... passed away, and a clearer and less ornate style became popular.” —Lecky: English in the Eighteenth Century, vol. i. chap. i. p. 91.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894