The phrase "drunk up" typically refers to finishing a drink or consuming a large amount of alcohol. Some synonyms for this phrase might include "downed," "gulped," "swallowed," "imbibed," "quaffed," or "slugged." Each of these words implies a similar level of consumption or finishing of a drink, but they may also carry different connotations or implications. For example, "downed" or "gulped" might suggest consuming something quickly or in a hurried manner, while "imbibed" might imply a more leisurely or deliberate drinking experience. Regardless of the synonym used, it's important to consume alcohol responsibly and in moderation to avoid negative consequences.