0 a sudden increase in a business etc -- der Aufschwung
a boom in the sales of tablet computers.
1 to increase suddenly (and profitably) -- einen Aufschwung machen
Business has been booming this week.
2 (often with out) to make a hollow sound, like a large drum or gun -- dröhnen
His voice boomed out over the loudspeaker.
3 such a sound -- das Dröhnen