One possible synonym for "stir the embers" is to "rekindle," which suggests the act of reigniting a flame that has dwindled or gone out. Another option might be to "fan the flames," which implies the idea of actively encouraging or intensifying a fire. Alternately, one could use the phrase "rake the coals," which has a similar connotation of stirring or manipulating the embers to create more heat and light. Other potential synonyms for "stir the embers" could include terms like "stoke the fire," "revive the warmth," or "reawaken the blaze," depending on the desired tone and context of the text.