What is meant by the term 'bitter end'?

The term 'bitter end' refers to the free end of a line, rope, or chain that's unfastened. In nautical contexts, it is specifically used to indicate the end of the line that is not tied or secured, often left hanging when the line is not in use or is being stored. This terminology originates from traditional seafaring practices where the bitter end of a rope might be left loose, indicating it is available for use or handling.

Understanding this term is essential for anyone involved in seamanship or working aboard a naval vessel, as it relates to maneuvering lines safely and effectively. The other definitions provided do not capture the recognized meaning of 'bitter end' in nautical terminology.