to throw a sprat to catch a mackerel
throw
θrəʊ
threw
a
ə
ē
sprat
spræt
sprāt
to
catch
kæʧ
kāch
a
ə
ē
mackerel
mækərəl
mākērēl

英語での「throw a sprat to catch a mackerel」の定義と意味

to throw a sprat to catch a mackerel
01

*to expend or risk a small amount of effort or money that has the potential to yield much greater benefits or rewards 

When big retailers like them offer cash-back prizes, they are throwing a sprat to catch a mackerelthe money they make from sucking in customers more than outweighs what they spend in actual payouts. 
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