low rumbling ( synonym found)
Definition of low rumbling:

(adj) : Deep and slow sounding
"his rumbling voice fit the solemn occasion."
(n) : the sound of complaint
"the rumblings of the masses precedes the crumbling of the state."
Definition of low rumbling:

(adj) : Deep and slow sounding
"his rumbling voice fit the solemn occasion."
(n) : the sound of complaint
"the rumblings of the masses precedes the crumbling of the state."
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