There are various synonyms for the phrase "light the fuse" that can be used depending on the context. Some of the synonyms include ignite, set off, trigger, spark, activate, start, initiate and begin. These synonyms connote a sense of initiation, instigation, or commencing an action or event. With each synonym, there is a feeling of power and impact leading to consequences or outcomes, be it negative or positive. The phrase "light the fuse" is a metaphorical expression that suggests the beginning of something potentially explosive and uncontrollable, and its synonyms capture the same sentiment in different words.