Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: From the sound

thrum

 verb
     
Related topics: Textures, Sounds
thrum past tense and past participle thrummed, present participle thrumming [intransitive]
CS to make a low sound like the sound of an engine:
The engine thrummed into life.
—thrum noun [singular]
the thrum of passing cars
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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