"shoals" in the noun sense
1. shoal
a sandbank in a stretch of water that is visible at low tide
2. shoal, shallow
a stretch of shallow water
3. school, shoal
a large group of fish
"a school of small glittering fish swam by"
"shoals" in the verb sense
1. shallow, shoal
make shallow
"The silt shallowed the canal"
2. shallow, shoal
become shallow
"the lake shallowed over time"
Source: WordNet® (An amazing lexical database of English)
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