Definition
to swiftly consume a drink, particularly a significant amount of alcohol
猛喝；饮尽（尤指酒精饮料）
They knocked back a few whiskeys at the party.
他们在派对上快速喝下了几杯威士忌。
If you keep knocking back drinks like that, you're going to feel ill.
如果你一直这样快速喝下饮料，你会感觉不舒服的。
After celebrating their victory, the team members eagerly knocked back the champagne.
庆祝胜利后，队员们急切地喝下了香槟。