"Turn steam" is a commonly used phrase that refers to gearing up for action and pushing forward with energy and vigor. There are numerous synonyms for this phrase that can be used to add depth and variety to your writing or speech. Some options include "ramp up," "revitalize," "ignite," "trigger," "unleash," "galvanize," "animate," "stir up," "spur on," and "infuse." Each of these words captures the sense of energy and momentum associated with turning steam, and they can be used to convey different shades of meaning or create a unique tone or voice for your written or spoken work.