The phrase "at elbow" is often used to refer to something that is within reach or close proximity. Some potential synonyms for this phrase could include "within arm's reach," "nearby," "accessible," "close at hand," "within easy reach," or "adjacent." Other possible synonyms could depend on the specific context in which the phrase is used. For example, in a medical context, the phrase "at elbow" might be synonymous with "at your side," "beside you," or "within your range of motion." Ultimately, the most appropriate synonyms for "at elbow" will depend on the specific context and desired meaning.