/ ˈɪŋkjʊbəs; NAmE / noun ( pl. in·cu·buses or in·cubi / -baɪ; NAmE /)
1.
( literary ) a problem that makes you worry a lot
2.
a male evil spirit, supposed in the past to have sex with a sleeping woman
—compare succubus
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WORD ORIGIN
Middle English : late Latin form of Latin incubo nightmare, from incubare lie on, from in- upon + cubare to lie.