The term 'USE A ZEN GARDEN' can be summarized by the crossword solution 'MEDITATE, ' which is an 8-letter word. Meditating is a practice that has been used for centuries in many cultures, and is often associated with Buddhism. It involves focusing on one's breath and allowing thoughts to pass without judgment or attachment. In a Zen garden, meditating can be done while walking through the garden, admiring the beauty of nature, and reflecting on life.