Definition of knock something back in US English:

knock something back

phrasal verb

informal
  • Consume a drink quickly and entirely.

    ‘we knocked back a few beers’
    • ‘Once again Hemingway mechanically picks up his glass, knocks it back in a single gulp, and slams it back down.’
    • ‘We clinked glasses and I knocked my drink back, feeling the burn in my throat and the warmth in my stomach.’
    • ‘The recommended way to enjoy soju or sake, the national drinks of South Korea and Japan, is by quickly knocking them back in short, small shots.’
    • ‘Some bars sell highballs for as little as 75 cents, allowing some people to knock them back like there's no tomorrow.’
    • ‘Four out of 10 men, it said, and two out of 10 women regularly knock back at least a bottle of wine in one session to land them in the binge-drinker category.’
    • ‘Pandora settled down again and enjoyed the mood: everyone was chatting or drinking, mostly vodka, knocking it back like Perrier water.’
    • ‘Vodka was limited mostly to the liquor cabinets of Eastern Europe until World War II, when Americans and the rest of Europe started knocking it back.’
    • ‘True beer aficionados know damn well there's more to enjoying a good brew than just knocking it back with detached abandon - sip, gulp, belch.’
    • ‘She poured herself a glass of wine and knocked it back and poured another, then turned to face him.’
    • ‘Drinkers across the social spectrum are knocking it back like never before and the pressure to join in has never been stronger.’
    swallow, gulp down, drink up, swill down, swill, quaff, guzzle, toss off, consume, finish
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