a sprat to catch a mackerel

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Related to sprat: IRATA

a sprat to catch a mackerel

BRITISH, OLD-FASHIONED
If you describe something you do as a sprat to catch a mackerel, you mean that it involves a small cost or amount of effort but it will bring you great rewards or benefits. Setting a sprat to catch a mackerel, the store is offering in its summer sale a chrome blender for £99 (was £149) to those who spend £50 or more. Note: A sprat is a type of small fish and a mackerel is a larger fish. Both fish may be eaten.
See also: catch, mackerel