"Grab a bite" means to eat a quick meal or snack, often in a hurry.
Here are some examples:
* "I'm starving! Let's grab a bite before the movie starts."
* "I only have a few minutes for lunch, so I'll just grab a bite at my desk."
The idiom can also be used with other words to describe the type of food being eaten, like "grab a quick bite" or "grab a bite to eat".
Let me know if you'd like to know the meaning of another idiom! 😊