The Collaborative International Dictionary
Friborg
Friborg \Fri"borg\, Friborgh \Fri"borgh\, n. [AS. fri[eth]borh,
lit., peace pledge; fri[eth] peace + borh, borg, pledge, akin
to E. borrow. The first part of the word was confused with
free, the last part, with borough.] (Old Eng. Law)
The pledge and tithing, afterwards called by the Normans
frankpledge. See Frankpledge. [Written also friburgh
and fribourg.]
--Burril.
Wiktionary
friborg
n. (context historical legal UK English) The pledge and tithing, afterwards called by the Normans (term: frankpledge).