WordReference Random House Unabridged Dictionary of American English © 2024po•co a po•co (pō′kō ä pō′kō; It. pô′kô ä pô′kô),USA pronunciation [Music.]- gradually;
little by little:poco a poco accelerando.
Collins Concise English Dictionary © HarperCollins Publishers::
poco a poco adv - (in combination) little by little: poco a poco rall
Etymology: Italian