How do you say ‘makikikain’ or ‘sabay/makisabay kumain’ in English?

You will use ‘do’

Merriam-Webster’s usage of ‘do’: To partake of

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makisabay magtanghalian

Makisabay ka na magtanghalian sa akin.

 

Let’s do lunch. (Merriam-Webster’s sample)

makihapunan/makipaghapunan

Halika. Makihapunan/makipaghapunan ka na sa amin.

 

Come. Do dinner with us.

makialmusal

Puwede ba akong makialmusal?

 

Can I do breakfast with you?

nakikikain

Sa ngayon, nakikikain ang kapatid ko sa bahay ng pinsan namin.

 

Right now, my brother is doing meal at our cousin’s house.