adumbrate
To foreshadow vaguely.
transitive
From track level, its operating floor looks particularly capacious, but there is a vacant space at one end which was designed to accommodate the control panel for the Perth-Inverness C.T.C. scheme; this was adumbrated as long ago as the 1955 Modernisation Plan, but now seems to be regarded as an unjustifiable luxury.
To give a vague outline.
transitive
Accordingly, even though readers always and understandably speak of the theories adumbrated by Socrates here as "Plato's theories", one ought not to speak of them so without some compunction--the writing itself, and also Plato the author, present these always in a spirit of open-ended exploration, and sometimes there are contextual clues indicating that Socrates exaggerates or goes what the argument truly justifies, and so on.
To obscure or overshadow.
transitive
Where it comes from
Borrowed from Latin adumbrātus (“represented in outline”), from adumbrāre (“cast a shadow on”), from umbra (“shadow”).
Adapted from the Wiktionary entry adumbrate (CC BY-SA 4.0).