The phrase "keep arms length" is commonly used to advise someone to keep a safe distance or to avoid getting too close. Antonyms for this phrase would be to come closer, to embrace, or to be intimate. Depending on the context, these antonyms may be appropriate or inappropriate. In professional settings, it is important to maintain a certain distance, while in personal relationships, closeness and intimacy are desirable. It is important to understand the appropriate level of closeness or distance required for different situations, and to adjust accordingly to ensure that boundaries are respected and maintained.