boom/ bum /
verb (used without object)
to make a deep, prolonged, resonant sound.
to move with a resounding rush or great impetus.
verb (used with object)
to give forth with a booming sound (often followed by out):
The clock boomed out nine.
to boost; campaign for vigorously:
His followers are booming George for mayor.
noun
a deep, prolonged, resonant sound.
the resonant cry of a bird or animal.