The phrase "hadst full plate" refers to a situation where a person is very busy or has a lot on their plate. The antonyms for this phrase would be "idle," "unoccupied," "free," "vacant," and "available." When a person has an empty plate, they are not busy or burdened with tasks. They have free time to do things they enjoy. Similarly, a person with a vacant plate has very little to do and can take on more tasks if needed. Thus, having an empty, free, or vacant plate means having time and space to relax, unwind, and recharge.