earth up - Wiktionary, the free dictionary
From Wiktionary, the free dictionary
earth up (third-person singular simple present earths up, present participle earthing up, simple past and past participle earthed up)
- (horticulture, transitive) To cover the stem or leaves of plants with soil, as to encourage root growth or protect from cold.
Earth up a potato crop several times during the season to encourage more tubers to grow.
cover with soil