incubate
verb
[ ˈɪŋkjʊbeɪt ]
• (of a bird) sit on (eggs) in order to keep them warm and bring them to hatching.
• be developing an infectious disease before symptoms appear.
• "the possibility that she was incubating early syphilis"
Origin:
mid 17th century: from Latin incubat- ‘lain on’, from the verb incubare, from in- ‘upon’ + cubare ‘to lie’.
