DTH reactions may include, but are not limited to, contact dermatitis (eg, poison ivy rash), tuberculin skin test reactions, granulomatous inflammation (eg, sarcoidosis, Crohn disease), allograft rejection, graft versus host disease, and autoimmune hypersensitivity reactions.
tricks of the trade. 1  Clever ways of operating a business or performing a task or activity, especially slightly dishonest or unfair ones. For example, Alma knows all the tricks of the trade, cutting the fabric as close as possible, or The butcher weighs meat after it's wrapped; charging for the packaging is one of the tricks of the trade.
Bait and Switch. A deceptive sales technique that involves advertising a low-priced item to attract customers to a store, then persuading them to buy more expensive goods by failing to have a sufficient supply of the advertised item on hand or by disparaging its quality. This practice is illegal in many states under their Consumer Protection laws.