Sour sour:
(1) bocer, "immature," "unripe": "The fathers have eaten sour grapes" (Jeremiah 31:29, Ezekiel 18:2; compare Isaiah 18:5 the King James Version).
(2) cur, "to turn aside," "degenerate": "Their drink is turned sour" (the King James Version margin "gone," the Revised Version margin "Their carouse is over").