2. (a.) Rushing with violence; swelling with a hollow sound; making a hollow sound or note; roaring; resounding.
3. (a.) Advancing or increasing amid noisy excitement; as, booming prices; booming popularity.
4. (n.) The act of producing a hollow or roaring sound; a violent rushing with heavy roar; as, the booming of the sea; a deep, hollow sound; as, the booming of bitterns.