A continuous low humming sound
“In the distance, he heard the thrum of an approaching vehicle.”
A low droning or rumbling sound
Cotton, nylon, or other fibers spun into long, thin strands and used for sewing
To make a monotonous drumming noise
“He seated himself in the chair and began to rapidly thrum his fingers on the ends of the armrests.”
To play a string instrument, especially in a rhythmic way
“He began to thrum his guitar and sing in the curious wailing chant of the hill people.”
To make a low, steady continuous sound
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