The phrase "pass the Rubicon" is an idiom used to describe a point of no return. Antonyms for this expression would be words and phrases that imply "retreat," "turn back," or "cancel." Some possible antonyms for "pass the Rubicon" include "reconsider," "retract," "revoke," "back down," "abandon," "yield," "retreat," or "withdraw." These words suggest a change of direction or a willingness to consider alternatives, indicating that the speaker is not yet committed to the action they originally intended to take. Choosing one of these antonyms instead of "pass the Rubicon" can convey hesitation or uncertainty in decision-making.