1) Grew 1) Grew rapidly 2) Grew swiftly 3) Increased significantly 4) Made a loud sound 5) Prospered rapidly 6) Resounded 7) Sounded like a cannon 8) Sounded like an explosion 9) Sounded like thunder 10) Spoke loudly 11) Thundered 12) Was prosperous 13) Was suddenly successful 
• (imp. & p. p.) of Boom