Downing hatch is a common phrase used to describe the act of drinking alcohol quickly and in large quantity. However, there are many synonyms for this term. Some popular alternatives to downing hatch include chugging, guzzling, gulping, swilling, and slamming. Other phrases that can be used to describe the same act include tossing back, knocking back, throwing down, and pounding. These phrases all refer to the same activity of consuming an alcoholic beverage quickly and in large quantities. While downing hatch may be the most common phrase used, it is always good to have a variety of synonyms in your vocabulary.