The antonyms for the phrase "dusts off" could be "neglect," "ignore," or "abandon." These words convey the idea of not taking care of something or not giving it the attention it deserves. For instance, neglecting a valuable item and allowing it to gather dust would be the opposite of "dusting it off" and making sure it stays clean and in good condition. Alternatively, "ignoring" or "abandoning" something could mean leaving it untouched for an extended period, resulting in it accumulating dust over time. Therefore, the opposite of "dusting off" could include any action that involves not taking care of something properly or leaving it to gather dust.