There are various synonyms for the phrase "dug it," which means to understand or appreciate something. Some of these synonyms include "got it," "grasped it," "comprehended it," "caught on," "fathomed it," "took to it," and "saw the light." These phrases all indicate a sense of understanding or enjoyment of a particular situation, concept, or activity. For example, if someone says that they "dug" a particular song, they might also say that they "got into it" or "really enjoyed it." Similarly, if someone says that they "dug" a particular book, they might also say that they "got into the characters" or "appreciated the writing style".