From WordNet (r) 3.0 (2006) [wn]:
boom out
v 1: make a deep hollow sound; "Her voice booms out the words of
the song" [syn: boom, boom out]
From WordNet (r) 3.0 (2006) [wn]:
boom out
v 1: make a deep hollow sound; "Her voice booms out the words of
the song" [syn: boom, boom out]