the.com/concern
The polite mask worry wears to a dinner party.
means A matter that troubles or interests you, or the act of caring about it.
from From Latin concernere, to sift together or mix — anxiety and attention stirred into one pot, later distilled into business jargon for any company worth fretting over.
Corporate twistA going concern is a business expected to survive.
Passive-aggressive favoriteI have concerns rarely means just one.
Whose concernNone of yours, traditionally, is the sharpest reply.