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RUBICON
Definition of RUBICON
noun
A limit that when surpassed cannot be returned from, or an action that when taken cannot be reversed.
Wiktionary · CC BY-SA
Where it comes from
The noun is derived from the phrase cross the Rubicon (“to make an irreversible decision or to take an action with consequences”). Julius Caesar’s crossing of the Rubicon, a small river in northeastern Italy, on 10 January 49 B.C.E., indicated his intention to start a civil war with Pompey. Rubicon is derived from Latin Rubicō, Rubicōn (“the Rubicon”), possibly from rubeus (“red, reddish”), from rubeō (“to be red”), ultimately from Proto-Indo-European *h₁rewdʰ- (“red”), an allusion to the colour of the river caused by mud deposits. The verb is derived from the noun.
Etymology via Wiktionary (CC BY-SA).
Word DNA
Line of descent
- Proto-Indo-European
- Latin
- English
2 recorded generations before English.
Deepest traced root
2nd
of 59 source languages in OUTLIER
14.2%
of traced words share this origin (11,700)
How it is built
Same root, RUBICON · 2 relatives in the game
Every Proto-Indo-European word → · The Word DNA of OUTLIER →
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
RUBICON in OUTLIER
Players have found it on 48 boards so far. 336 players have found it across Outlier's history.
It first turned up on Day 11, 31 May 2026. The most recent board was Day 164, 31 October 2026. Nobody has seen it on a board for 1 day.
First ever to find it
on Day 11, 31 May 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
RUBICON starts with R and ends with N. Sorted, its letters read BCINORU - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Words that start RUBICO
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 11
Could you have found RUBICON?
OUTLIER is a daily word game. One grid, the same grid for everybody, and the words nobody else spots are the ones that pay. This word was on Day 11 - and most players walked straight past it.
Play today's OUTLIER