KiTh aNd kIN[kith and kin] – phrase/idioms. - one's relations. The word kith is Old English, and the original senses were ‘knowledge’, ‘one's native land’, and ‘friends and neighbours’. oRiGIn: The phrase kith and kin originally denoted one's country and relatives; later one's friends and relatives. -KinS [-k-nn-s]- a diminutive suffix of nouns: indicates smallness or, by semantic extension qualities such as familiarity and affection as in daddykins - a name a child calls their father when they want something.