The phrase "gives the lowdown" refers to providing the basic, inside story about something. Some antonyms for this phrase are: keeps quiet, withholds information, obscures details, and conceals the truth. If someone is not forthcoming with details, they might avoid the conversation altogether, steaming away from the topic, or even lie outright. In contrast, someone who "gives the lowdown" is direct, transparent, and trustworthy. It is important to be aware of these antonyms when communicating in all types of social or professional situations, as withholding or obscuring information can damage one's credibility and trustworthiness.