A BITE TO EAT
What is the Meaning of the Idiom
A BITE TO EAT?
for those learning to speak English as a Second, or Additional, Language (ESL or EAL)
Definition:
A bite to eat means something to eat. It suggests a simple meal, rather than an elaborate formal dinner.

Sometimes this is used with the verb grab. See example 2.
Examples:
1. Let’s have a quick a bite to eat before we leave home so we don’t have to stop somewhere and buy lunch.
2. Summer is a great time to grab a bite to eat at a restaurant patio.
More English expressions and phrases
