What does the morrow do?

"Morrow" is a word that usually refers to the next day. It's a poetic or archaic way of saying "tomorrow".

It doesn't have any specific actions or functions, just like "tomorrow" doesn't. It's simply a way of indicating the day following the current one.

Do you have a specific context in mind where you encountered the word "morrow"? Maybe knowing that context would help me understand what you're asking.