The phrase "keep bay" means to keep something or someone at a distance, either for safety or to avoid confrontation. Antonyms for this phrase might include words like "approach," "welcome," "embrace," or "engage." In these cases, rather than keeping something or someone at bay, the speaker is actively welcoming them closer, either physically or metaphorically. Other antonyms for "keep bay" might include expressions like "invite in," "allow access," or "open the door." In each case, the opposite of "keeping at bay" is to allow for interaction and engagement, rather than pushing something away.