A late word for chance
Luck names what happens to a person by chance, whether the outcome helps or hurts. In ordinary speech the bare noun often leans toward the welcome kind: a lucky break, a run of luck, the hope that luck is on your side. Speakers still mark the other side with adjectives such as bad, hard, or ill. The word feels as if it had always been English. It had not.
Old English had no luck. Before the loan settled in, prosperity and success were often covered by spēd, later speed, a word that pointed to thriving and sometimes to divine help rather than to the fall of dice. Chance, borrowed from French in the thirteenth century, already named how events fall. What English still lacked was this short northern word for personal fortune.
Borrowed across the North Sea
The origin of the word luck is a fifteenth-century borrowing, most likely from Middle Dutch luc, a shortened form of gheluc or gelucke, happiness or good fortune. A near twin is Middle Low German lücke, beside the prefixed gelücke. Standard dictionaries treat the English noun as a Dutch loan, while some handbooks leave room for Dutch, Low German, or Frisian as the immediate source. Those languages sat in the same trading world, and the forms are close enough that a single North Sea path is the honest picture.
Dates for first English use sit in a narrow band. Some etymological dictionaries put the noun around 1500. Other surveys prefer the 1480s. The earliest dictionary citation is from before 1475 in the bilingual glossary Promptorium Parvulorum, but that line is shaky: another manuscript reads lukre, and the Latin gloss is lucrum, so the entry may belong to lucre rather than luck. Either way, the word is late Middle English, not a native inheritance.
A common suggestion is that it arrived as a gambling term. Low German speech supplied English with a cluster of gaming words in the fifteenth and sixteenth centuries, and the sense of chance still clings to luck. That route is plausible. It is not proven.
The prefix English never kept
In Dutch and German the everyday modern nouns keep a prefix: geluk, Glück. That ge- (older ge-, ghe-, or gi-) is a collective marker of the same family as the old English y- in fossil words such as yclept. English took the short form luc or luk and never put the prefix back. Dutch still has luk, but it is now rare and regional; geluk is the standard word.
The prefixed noun is late even on the Continent. It is not an ancient pan-Germanic heirloom. Attestations begin in the twelfth century, apparently first in Rhine Franconian, then move into wider Middle High German in the thirteenth. From there the short and prefixed forms spread north and west. Scandinavian languages borrowed the Low German word rather than inheriting a cousin of their own: Icelandic lukka is recorded in the fourteenth century; Swedish lycka and Danish and Norwegian lykke follow the same route. West Frisian gelok belongs with the Dutch set.
A root that will not settle
Beyond that cluster the trail ends. No Old English ancestor exists, and attempts to pin the Germanic base to a deep Indo-European root have not held. A link with German gelingen, to succeed, looks tempting by meaning but fails on morphology, and gelingen itself has no clear relatives. A link with verbs of closing or locking — English louk, Dutch luiken, reconstructed Proto-Germanic *lūkan- — is easier on form. One Dutch handbook even sketches a path from what is closed or decided to fate. The sense jump remains a stretch, which is why current dictionaries either flag the idea as formally possible and semantically weak or simply call further origin unknown.
Other guesses fare no better. German locken, to entice, has been tried. So has a tie to Lücke, a gap or opening, read as opportunity and then as chance. A distant connection with Latin lux, light, has been offered and rejected. Luck and Lucifer do not share a history.
From fortune to a verb
From the start, luck could be good or bad. English still says bad luck and ill luck. Over time the unmodified noun often implies the good kind, so speakers add a qualifier when they mean the reverse. That double life — fortune in general, and good fortune in particular — is already visible in the Dutch and German relatives, where the same stem covers happiness, success, and chance.
The noun then seeded a large set of idioms, mostly from the eighteenth and nineteenth centuries. Out of luck is recorded by 1789. Better luck next time appears in the early 1800s. Good luck as a send-off to someone setting out is around 1805. Down on one's luck is attested by 1832, no such luck by 1835, in luck by 1857. Luck of the draw, from card play, is late nineteenth century. Push one's luck is early twentieth.
English also made a verb, twice. Middle English had lukken, to happen or to turn out well, from the noun or from Middle Dutch lucken. That verb died. The modern verb luck, to meet with good fortune, is a twentieth-century remake, with luck into from 1944 and American luck out, to succeed by chance, from 1946.
The sibling on the map
If you want a single reminder of how recent this word is, look at German Glück. English luck is the unprefixed sibling of that form, borrowed late, shared with Dutch geluk and with Scandinavian words that were themselves Low German imports. The family is wide, the first English date is late medieval, and the deeper root is still a blank.