cross the Rubicon
Refers to Julius Caesar's crossing of the Rubicon River to wage civil war with Rome, on January 10, 49 BC, in violation of law. Suetonius' use of the phrase the die is cast in describing this act popularised the use of that phrase, which was first attributed to the Greek dramatist Menander.
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- (idiomatic) To make an irreversible decision or to take an action with consequences.
- He knew that by coming out to his family he would be crossing the Rubicon but he could not live a lie anymore.