The term "giving the lowdown" is often used to describe providing information or details about something. Antonyms for this phrase could include "keeping quiet" or "withholding information." Other contrasting terms might include being vague, ambiguous, or evasive. These antonyms imply a lack of clarity, honesty, or transparency in communication, rather than a willingness to share knowledge or insights. By contrast, synonyms for "giving the lowdown" might include "informing," "reporting," or "explaining," which convey a more positive, proactive approach to providing information. Ultimately, the choice of words depends on the speaker's intent, tone, and desired outcome in any given situation.