I’m looking for a way to express a concept succinctly, as in one phrase (or one word, if possible). Here is the long version: I’d be indebted to any readers who can come up with a short version.
Someone can be “dangerous to know,” as in Lady Lamb’s description of Lord Byron: “Mad, bad, and dangerous to know.” As in, keep this person in your association, and you are headed for trouble.
What I’m looking for is the opposite: keeping this person in your association will act as a protection to you. “Safe to know” doesn’t cover it, because any random beta is safe to know—safe just means “non-threatening.” The concept I have in mind can be very threatening—but on your behalf. I’m looking for the opposite of “dangerous to know,” not its simple absence.
Phrases in common use that dance around it but miss it:
—“will get your back” (communicates intent but not necessarily competence)
—“has your back” (better in that it communicates competence, but implies that this is a constant, active thing, rather than a state of competence and willingness)
—“I’m glad he’s on our side!”
—“reliable” is close, but is a term applicable to chumps as well as saviors.
—“makes you feel safer because you know them” is the meaning I’m looking for, but is too wordy.
Anyone has a moment of vocabulary enlightenment, please share.