The phrase "catch dust" can be replaced with a number of synonyms to convey a similar idea. These synonyms include "gather dust," "accumulate dust," "collect dust," "amass dust," and "harbor dust." Each of these synonyms suggests the idea of dust building up on a surface over time, indicating neglect or disuse. Other variations on this theme might include phrases such as "become coated in dust," "be covered with dust," or "be obscured by dust." Regardless of the specific synonym used, the idea is to convey the image of a surface or object that has remained undisturbed for an extended period of time.