There are several synonyms for the phrase "gat it down," which means to drink or consume quickly. One common synonym is "chug," which implies a quick and forceful gulp of liquid. Another option is "down in one," which suggests a challenge to drink an entire serving in a single go. "Slug" and "gulp" are also suitable synonyms, indicating the swift and efficient consumption of a beverage. Finally, "swig" and "quaff" are more refined alternatives that imply a sophisticated or leisurely intake of a drink. Regardless of the synonym used, the meaning remains the same - to consume a beverage quickly and efficiently.