thrum

definition: a thrumming sound
example: I could hear the thrum of a banjo from down the street.
speech part: noun
synonyms:
definition: make a rhythmic sound
example:
speech part: verb
synonyms: beat
definition: sound the strings of (a string instrument)
example:
speech part: verb
synonyms: strum
definition: sound with a monotonous hum
example:
speech part: verb
synonyms: hum

How thrum is being used?