Final answer:
In the dialogue, 'faux pas' refers to a social blunder, which implies an inappropriate or awkward action that may lead to social embarrassment or negative consequences.
Step-by-step explanation:
The phrase "faux pas" in the dialogue signifies option 2: a social blunder. This French expression is used to describe an action or a remark that is socially awkward or inappropriate, potentially causing embarrassment or discomfort in a social setting. In the context of the passages provided, it reflects an action that could be a mistake in judgment, particularly in delicate or high-stakes situations such as courtly intrigues or social affairs, where the wrong move or disclosure could seriously affect one's reputation or position.