to let an opportunity slip by when it is right in front of one; to miss someone or something face-to-face; same as [[失之交臂|失之交臂|shi1 zhi1 jiao1 bi4]]

to challenge or question someone face to face in order to clarify the truth; to bring parties together for a direct confrontation

literally "gongs and drums facing each other"; means to come together to resolve a problem or speak the truth openly and directly in person