a large number of fish swimming together

a shoal of bream

(of fish) form shoals

these fish can safely be released to shoal with most adult species

an area of shallow water

we clawed our way out from the Bahamian shoals into the deep waters of the Atlantic

(of water) become shallower

the water shoals reasonably gently, and the swimming is safe

(of water) shallow

crabs will move to shoaler water when the current changes