Synonyms of 'knock something back'
▷ See knock
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If you say that someone downs food or a drink, you mean that they eat or drink it.
We downed several bottles of local wine.
If you guzzle something, you drink it or eat it quickly and greedily.
She had been guzzling gin and tonics all evening.
Thesaurus for knock something back from the Collins English Thesaurus