Where does “hackday” come from?

hackday (English) comes from English hack, from English hackysack, from English hackeysack, from English sack, from Middle English sak, from Old English sacc, from Old English sæcc, from Proto-West Germanic sakku — sack; sackcloth; sackcloth vestment, penitential...

hackday (English): The day when a hackathon is held

Definitions

  1. The day when a hackathon is held

Ancestry of “hackday”, step by step

hackday traces back through two separate lines of ancestry.

via English hack

StepLanguageWordMeaning
1EnglishhackTo chop or cut down in a rough manner; To cough...
2EnglishhackysackAlternative form of hackeysack
3EnglishhackeysackA non-competition sport in which a small sack, or...
4EnglishsackA bag; especially a large bag of strong, coarse...
5Middle Englishsakbag, sackcloth
6Old Englishsaccsack, bag
7Old Englishsæccbattle, strife, fighting
8Proto-West Germanicsakkusack, bag
9Proto-Germanicsakkuzsack, bag, purse
10Latinsaccussack, bag; purse, wallet, moneybag; garment of...
11Ancient Greekσάκκοςsack; sackcloth; sackcloth vestment, penitential...

via English Day

StepLanguageWordMeaning
1EnglishDayderived from a medieval diminutive of David
2Middle Englishdayday; daylight, sunlight; epoch, age, period
3Old Englishdæġday, daytime
4Proto-West Germanicdagday
5Proto-Germanicdagazday; name of the D-rune
6Proto-Indo-Europeandʰegʷʰ-to burn; warm, hot
Every word from Ancient Greek σάκκοςEvery word from Latin saccusEvery word from Proto-Germanic sakkuz