Bush up is a phrasal verb that refers to decorative landscaping practices, such as trimming shrubs or planting foliage. Antonyms for bush up might include options such as letting nature take its course, allowing shrubbery to grow wild and natural, or opting for paved or concrete landscaping. In contrast to bushing up, neglecting shrubbery or allowing it to become overgrown could also be considered an antonym. Choosing a minimalist approach to landscaping or opting for desert landscaping could also be considered an antonym to bushing up, as these styles typically involve minimal foliage and a focus on natural elements such as rocks or sand.