The phrase "loose for sea" is typically used to describe a ship that is ready to depart from port. Here are some synonyms that can be used in place of this phrase:
- Ready to sail
- Set to sea
- Prepared for departure
- All set to embark
- Cleared for sailing
- Poised for voyage
- Ready to leave port
- Set sail-bound
- Prepared to cast off
- Embarking soon
All of these phrases indicate that a vessel is fully equipped and prepared to leave port, and is typically a signal for the crew to take their positions and begin the journey. Whether you're talking about a massive cargo ship or a small pleasure boat, these synonyms convey the same sense of readiness and anticipation.