shoal
UK[ʃəʊl]US[ʃoʊl]
n
a large number of fish swimming together as a group.
n
a shallow area in a sea, lake, or river, especially one where the water is not deep enough for a boat to sail safely.
v
(of fish) to form a shoal.
Etymology
the word 'shoal' presents a fascinating case of convergent etymology from two distinct old english sources. the noun meaning 'shallow place' derives from old english 'sceald' (shallow), related to 'shallow' itself. the noun meaning 'large group of fish' comes from a separate old english word, likely related to 'school' in the aquatic sense. both streams merged into the identical modern spelling 'shoal' due to phonetic evolution and perhaps folk association, as fish often gather in shallow waters. this historical coincidence created a single modern word with two logically connected yet etymologically distinct primary meanings.
Analysis
the word is a simplex. its modern spelling and form do not allow for segmentation into meaningful, distinct morphemes based on its current english spelling.
Examples
a shoal of herring was visible just below the surface.
the ship altered its course to avoid the dangerous shoal.
as the water warmed, the fish began to shoal near the estuary.