Shall we meet up for breakfast tomorrow?

Notes:

• Shall we? This is the same as saying why don't we? You are making a suggestion.
• You can say: why don't we meet up? / Shall we meet up? Same thing.
• Meet up. This means: meet.
• Why do we say: meet up? Well, you don't have to.
• However, it's a very common thing to say and it's colloquial.

This sentence is an example of suggestions, phrasal verbs, colloquial expressions, food.