Grammar fix
grab a bite
eat something quickly
to eat a small or quick meal, usually because you're busy or short on time
expressionB1core
Hear it in context
Notice where the phrase sounds natural.
I've only got half an hour, so let's just grab a bite somewhere near the office.
We grabbed a bite at the station before the train.
Fix the pattern
One small grammar move makes it sound right.
Not: I only had time to grab bite at lunch.
Say: I only had time to grab a bite at lunch.
Keep the article: 'grab A bite'.