rumbling
n. B2 Upper Intermediate US //ˈɹəmbəɫɪŋ// UK //ɹˈʌmblɪŋ// rum·bling
n. a deep, low sound that is not very loud. You often hear this when a large machine is working or when the ground is shaking slightly.
n. a deep, low, continuous sound, typically produced by a large machine or the movement of the earth. Often used to describe the noise of a distant engine or the seismic activity of an earthquake.
The low rumbling of the train grew louder as it approached.
A distant rumbling shook the windows of the old house, making the residents look up at the dark clouds.
The rhythmic rumbling of the industrial machinery provided a constant backdrop to the workers' conversations, masking the occasional sharp clang of metal on metal.