Lieven found the source of this fake word!
There used to be a website called "Star Trek: Continuum" which had a "Klingon Compendium" section, in which someone (not Marc Okrand) had "expanded" the definitions provided by Okrand. See this message here:
The person who did this apparently didn't understand which of the English meanings of "betray" corresponded to {magh}, and so just copied the "indicate, reveal" definition from presumably a thesaurus. The entire "expanded" definition says "Verb, to commit treason. Also to indicate, reveal." This is *not* from Marc Okrand!
At some point, this definition entered the {boQwI'} database with the source abbreviated as "STC". But all the words revealed in Star Trek: Communicator had the source "STC 104", so I noticed it and added a note that the word might've been a typo.
I wonder how many other "expanded" definitions from Star Trek: Continuum have entered into people's databases? The definition {magh} "indicate, reveal" should be removed. (I also think {magh} "betray" doesn't belong on the KLI new words list, since it's already in TKD.)
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De'vID