interj. [ Prob. from ah! lack! OE. lak loss, failure, misfortune. See Lack. ] An exclamation expressive of sorrow. [ Archaic. or Poet. ] Shak. [ 1913 Webster ]
interj. [ For alack the day. Cf. Lackaday. ] An exclamation expressing sorrow. [ 1913 Webster ]
☞ Shakespeare has “alack the day” and “alack the heavy day.” Compare “woe worth the day.” [ 1913 Webster ]