This is the 359th most frequent Hebrew word.
כלומר
That is to say; in other words.
The word 'כלומר' is used here to clarify and provide specific examples for 'all kinds of fruits'.
אני אוהב את כל סוגי הפירות, כלומר תפוחים, בננות ותפוזים.
I love all kinds of fruits, namely apples, bananas, and oranges.
In this sentence, 'כלומר' is used to explain the context of 'very old' by providing further information.
הבית הזה מאוד ישן, כלומר, הוא נבנה במאה ה-19.
This house is very old, meaning it was built in the 19th century.
Here, 'כלומר' connects the statement about having a day off with the implied opportunities it allows, making the statement more descriptive.