money spider
US /ˈmʌn.i ˌspaɪ.dər/
UK /ˈmʌn.i ˌspaɪ.dər/
1.
a very small spider, especially a linyphiid spider, often seen on a person and traditionally believed to bring good luck or money
:
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A tiny money spider crawled across my hand, a sign of good fortune, they say.
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My grandmother always said that finding a money spider meant you'd soon receive unexpected cash.