Which of the following verbs means to drink heartily?

The verb "quaff" specifically refers to the action of drinking deeply or heartily, often in a way that suggests enjoyment or satisfaction. This term is commonly used to portray someone who is indulging in a drink, especially an alcoholic beverage.

The context in which "quaff" is used often evokes vivid imagery of someone enthusiastically consuming a beverage, which reflects both the action and the pleasure involved in drinking. The etymology of the word also aligns with this meaning, reinforcing its association with robust drinking.

In contrast, the other options do not share this meaning. For example, "quell" generally refers to suppressing something, "procrastinate" means to delay or postpone an action, and "pry" involves intruding into someone else's affairs or seeking personal information. Hence, "quaff" stands out as the only term that correctly conveys the idea of drinking heartily.