濟(jì)濟(jì)一堂 a gathering of many people; (a big audience) filled the hall.; a great assemblage of people in a hall; a large gathering in an auditorium; gather together under the same roof; the house is packed with guests.: 老、中、青濟(jì)濟(jì)一堂, 共同學(xué)習(xí), 相互激勵(lì)。 gathered together, the old, the middle-aged and the young studied side by side and encouraged each other