scheme
US /skiːm/
UK /skiːm/

1.
a large-scale systematic plan or arrangement for attaining some particular object or putting a particular idea into effect
:
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The government launched a new scheme to help the unemployed.
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The company devised a marketing scheme to attract more customers.
2.
a devious or underhand plot; a secret and dishonest plan
:
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They uncovered a fraudulent scheme to embezzle funds.
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His latest scheme involved tricking elderly people out of their savings.