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An initialism of "to be confirmed." Used in reference to something that is scheduled to happen but whose details may still be subject to change. We're pleased to announce that our third-annual Monster Mash Convention is being planned for the first weekend of June, though the date is TBC at the moment. Our team has everything ready for a Christmas release, but we're waiting on the marketing department for their final advertising strategy, so the launch window is still TBC.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.