sprat

sprat
a kind of small oily food fish found in most parts of the world;
the young of the herring fish,
Figures of Speech:
(a) to set a sprat to catch a whale
(a) to set a sprat to catch a whale
(b) to cast a sprat to catch a hake
(c) to set a sprat to catch a mackerel (‘sprat’ = small fish; ‘whale’, ‘hake’ and ‘mackerel’ = large fish)
= to take a little risk or to lose a little to gain much profit
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