Give lowdown is a colloquial phrase that means to provide essential information or details about a situation or topic. Antonyms, or opposite words to give lowdown, may include terms such as withhold information, keep quiet, keep mum, keep secret or keep silent. These words suggest that someone is not willing to reveal information, and may be avoiding giving an explanation or providing relevant details. Unlike giving a lowdown, the intention behind these actions is to keep information from others, or to avoid communicating important details. Using such antonyms can be detrimental to effective communication, especially in situations that require transparency and clarity.