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Thrum Sound θrʌm/ Verb  Past Tense Participlethrummed, Present Participle Thrumming) [Intransitive Make

Front thrum
Back /θrʌm/ verb 
(past tense and past participlethrummed, present participle thrumming) [intransitive]

to make a low sound like the sound of an engine:The engine thrummed into life.—thrum noun [singular]:the thrum of passing cars

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