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rubicon.

A limit that when surpassed cannot be returned from, or an action that when taken cannot be reversed.

7 characters3 syllables approx.English language

Meaning & usage

noun/ˈɹuːbɪkɒn/Received-Pronunciation/-k(ə)n/Received-Pronunciation/ˈɹubəˌkɑn/General-American
  1. A limit that when surpassed cannot be returned from, or an action that when taken cannot be reversed.

  2. Especially in bezique and piquet: a score which, if not achieved by a losing player, increases the player's penalty.

Where this word 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.

verb/ˈɹuːbɪkɒn/Received-Pronunciation/-k(ə)n/Received-Pronunciation/ˈɹubəˌkɑn/General-American
  1. Especially in bezique and piquet: to defeat a player who has not achieved the rubicon.

    transitive
Where this word 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.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.