underground economy
- IPA[ˌʌndəɡraʊnd ɪˈkɒnəmi]
英式
- the part of a country's economic activity that is unrecorded and untaxed by its government; the black market.
noun: underground economy
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- IPA[ˌəndərɡround ēˈkänəmē]
美式
- the part of a country's economic activity that is unrecorded and untaxed by its government; ...
Oxford American Dictionary