Grammar fix
knock back
drink something quickly
drink something quickly, often in one go
phrasal verbB2common
Hear it in context
Notice where the phrase sounds natural.
- She knocked back her coffee and dashed for the train.food
- He knocked back a pint and ordered another.food
Fix the pattern
Pattern: knock back something / knock it back
Using it for eating food; 'knock back' is mainly for drinks.
Patternknock back something / knock it back