Sc. Also cair-. [German has the corresp. kar-freitag (in MHG. karvrîtac, kartac) Good Friday, and karwoche (also in MHG.) Passion week; kar-sonntag appears not to be in use. OHG. chara, OE. caru, CARE in its earlier sense of sorrow, trouble, grief.]
According to Bellenden, Sunday immediately preceding Good Friday; but now generally used for the fifth in Lent (Jamieson).
1536. Bellenden, Cron. Scot. (1821), II. 497. Thus entrit Prince James in Scotland; and come, on Care Sonday, in Lentern, to Edinburgh [Boeth. dominicae passionis obviam.]
1538. Aberd. Reg., V. 16 (Jam.). Betuixt this & Cair Sonday.
a. 1575. Diurn. Occurr. (1833), 23. Lestit quhill caris sonday in Lentrone.
1825. Hone, Every-day Bk., I. 415. Care, or Carle Sunday is the fifth Sunday in Lent.