A skill associated with a particular job that makes one more proficient, often acquired through experience. You'll get better at taking dictation—you're a receptionist now, and it's a trick of the trade. When you're a pediatrician, being able to stay calm while dealing with panicked parents is a trick of the trade.

Certain clever or ingenious skills, techniques, or methods used by professionals to do something more easily or efficiently. My uncle used to be a tailor, so he taught me all the tricks of the trade to alter a shirt. My accountant friend is showing me the tricks of the trade to pay as few taxes as possible on my income.