Which term is defined as to throw off, let go, or unfurl?

The term that is defined as to throw off, let go, or unfurl is "Cast Off." This term is often used in nautical contexts to describe the action of letting go of lines or ropes that hold a vessel in place, thus allowing it to sail away from the dock or mooring. "Cast off" can also refer to shedding something like clothing, equipment, or cargo in a broader sense, which aligns with the idea of unfurling or letting go.

In nautical terminology, being familiar with phrases like "cast off" is important for effective communication on ships, as it directly relates to maneuvering and safety procedures. The term is embedded in naval operations, making it a critical concept for trainees to understand.

The other options, while they have some overlapping meanings, do not capture the specific act of throwing off or unfurling in the same manner that "cast off" does. For example, "release" could imply a broader sense of letting go without the specific connotation of preparation or action associated with casting off in a nautical context.