1. a large group of fish swimming together
2. a shallow area of water, especially one that is dangerous to ships
Usage: nautical

1. to form a large group (used of fish)
2. to become shallow
Usage: nautical

1. shallow
Usage: nautical

Examples

• A shoal of tuna moved through the deep water.
• The fishing boat encountered a massive shoal of sardines.
• The captain steered carefully around the dangerous shoal.
• Many ships have run aground on that rocky shoal.
• The fish began to shoal as the water temperature dropped.
• The river shoals near the bend, making it difficult for large boats to pass.
• We had to navigate through shoal waters to reach the harbor.