1. adjective /ʃəʊl/
Shallow.
But that part of the coast being shoal and bare, / And rough with reefs which ran out many a mile, / His port lay on the other side o the isle.
2. noun /ʃəʊl/
b) Any large number of persons or things.
3. verb /ʃəʊl/
a) To arrive at a shallow (or less deep) area.
b) To cause a shallowing.
Wikipedia foundation.