Webster's English Dictionary

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shoal

1. shoal \'sho-l\ aj [alter. of ME shold, fr. OE sceald - more at SKELETON] 
   : SHALLOW 
2. shoal n 1: SHALLOW  2: a sandbank or sandbar that makes the water shoal; 
   specif : an el evation which is not rocky and on which there is a depth of 
   water of six fathoms or less
3. shoal vi : to become shallow  1: to come to a shallow or less deep part 
   of  2: to cause to become shallow or less deep 
4. shoal n [(assumed) ME shole, fr. OE scolu multitude - more at SCHOOLM : 
   a large group (as of fish) : CROWD 
5. shoal vi : THRONG, SCHOOL