inumbrate
To put in shadow; to darken.
obsolete
An eclipse had suddenly inumbrated the moon, and as the black shadow was perceived stealing rapidly onwards, and casting a mysterious gloom over the face of nature[…]
Where it comes from
First attested in 1623; borrowed from Latin inumbrātus, perfect passive participle of inumbrō (“to shade”), see -ate (verb-forming suffix).
Adapted from the Wiktionary entry inumbrate (CC BY-SA 4.0).