Holiday

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Old English hāligdæg ‘holy day’.

wiktionary

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From Middle English halyday, holyday, halidei, haliȝdei, from Old English hāliġdæġ(“holy day, Sabbath”), equivalent to holy +‎ day. Compare West Frisian hjeldei(“holiday”), Danish helligdag(“holiday”), Norwegian helligdag(“holiday”), Swedish helgdag(“holiday, feast”).

etymonline

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holiday (n.)

1500s, earlier haliday (c. 1200), from Old English haligdæg "holy day, consecrated day, religious anniversary; Sabbath," from halig "holy" (see holy) + dæg "day" (see day); in 14c. meaning both "religious festival" and "day of exemption from labor and recreation," but pronunciation and sense diverged 16c. As an adjective mid-15c. Happy holidays is from mid-19c., in British English, with reference to summer vacation from school. As a Christmastime greeting, by 1937, American English, in Camel cigarette ads.

holiday (v.)

"to pass the holidays," 1869, from holiday (n.).