kith and kin 
(k

th

n k

n

)
KEY pl.n.
- One's acquaintances and relatives.
- One's relatives.
ETYMOLOGY:Middle English
kith, from Old English
c
th,
kinsfolk, neighbors; see
gn
- in Indo-European roots
WORD HISTORY: Kith is obsolete except in the alliterative phrase
kith and kin, which originally meant "native land and people" and first appeared about 1377 in
Piers Plowman. Kith comes from the Old English noun
c
th, "knowledge; known, familiar country; acquaintances, friends."
C
th in turn comes from the Germanic noun
*kunthith
, a derivative of
*kunthaz, "known." Germanic
*kunthaz was the past participle of a verb
*kunnan, "to know, know how," which became
cunnan in Old English. The first person singular of this verb,
can, is alive and well today, as is what was originally the verbal noun and adjective of
cunnan, namely
cunning, first appearing in the 14th century. Germanic
*kunthaz itself survived in the Old English adjective
c
th, "known, familiar," a word that became obsolete in southern English by 1600, but has survived in its negative,
uncouth. Modern English
couth is actually a jocular back-formation introduced by Max Beerbohm in 1896.