What is the X in X-mas?
Old English hwinan "to whiz or whistle through the air" (only of arrows), also hwinsian "to whine" (of dogs), ultimately of imitative origin (cf. Old Norse hvina "to whiz," German wiehern "to neigh"). Meaning "to complain in a feeble way" is first recorded 1520s. Related: Whined; whining.
1630s, from whine (v.).