This is the 772nd most frequent Urdu word.
بک
"بک" in Urdu means "nonsense" or "senseless talk."
Here, "بک" is used as a verb meaning 'to reserve'.
میں نے ایک نئی کتاب بک کی۔
I reserved a new book.
In this case, "بک" refers to a noun, meaning 'book'.
یہ بک بہت قیمتی ہے۔
This book is very valuable.
Here, "بک" is used in the context of scheduling or reserving a space as a verb.