Morrow is an old-fashioned word for the next day or the near future. When someone says “on the morrow,” they mean tomorrow. You'll find this word in older books and poems, where a character might say “I shall depart on the morrow” instead of “I'm leaving tomorrow.”

The word appears in familiar phrases we still use today. “Good morrow” was once a common greeting, like saying “good morning.” When we say someone should worry about something “on the morrow,” we mean they can deal with it later, not right now.

You'll encounter morrow mostly in historical fiction, poetry, or when someone wants to sound deliberately old-fashioned or theatrical. Shakespeare used it frequently. In Romeo and Juliet, characters speak of “tomorrow” and “the morrow” interchangeably. Today, using morrow in regular conversation would sound as unusual as wearing a suit of armor to school, but it helps us understand the language of the past and appreciate how English has evolved.