To resound means to fill a space with loud, echoing sound. When a thunderclap resounds across the valley, the noise bounces off the hills and seems to surround you. When applause resounds through an auditorium after a great performance, the clapping echoes off the walls and ceiling, filling the entire room with noise.

A gymnasium might resound with the squeaking of sneakers and bouncing basketballs during practice. A cave resounds with even the smallest noises because the stone walls reflect sound waves back and forth.

Resound can also mean to be widely celebrated or remembered. When we say that a victory resounds through history, we mean its impact echoes forward in time, still affecting people generations later. The Declaration of Independence resounds through American history because its ideas continue to matter centuries after it was written. A teacher's encouraging words might resound in a student's memory for years, coming back to mind whenever they face a challenge.