There are several synonyms for the phrase "rake up", which generally means to bring up a past issue or problem. Some synonyms include "revive", "rekindle", "resurrect", "reawaken", and "recall". These words all suggest the idea of bringing something back to life that was previously dormant or forgotten. Other synonyms for "rake up" include "bring to light", "uncover", "expose", and "reveal". These words carry a connotation of discovering something that was hidden or secret. Overall, these synonyms provide many different options for expressing the idea of bringing up a past issue or uncovering a hidden truth.