What does thrum mean?
Thrum is a literary word for a low, continuous humming sound and, as a verb, for making that sound. A machine, vehicle, or instrument may thrum, and the resulting noise can be called a thrum. The word often suggests a persistent vibration rather than a brief or high-pitched sound, as in the steady thrum of an old engine. In another, less common use, thrum means to speak in a monotonous, droning manner, often implying tiresome or emotionless delivery. Although current usage is relatively rare, thrum remains recognizable and expressive, giving physical and emotional atmospheres a compact verbal description. It is particularly useful when the important quality is not merely that something makes noise, but that its sound is low, continuous, and almost rhythmically unavoidable.
To make a continuous, low humming sound; to speak in a monotonous, droning manner.
"The washing machine thrummed loudly in the basement."
The verb is literary and uncommon, but it is especially effective for describing a persistent, low vibration.
A continuous, low humming sound, especially one produced by a machine, vehicle, or instrument.
"A distant thrum of machinery came from the factory."
The noun is literary and somewhat rare in modern usage.
The standard plural of the noun is thrums.
"The old machines filled the workshop with steady thrums."
Thrum names the low, persistent sound that gives an old machine or an empty room an almost mechanical heartbeat.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does thrum come from?
Thrum appears in English by the late sixteenth century, probably as an imitative formation representing the low sound of humming or vibration. Its noun use for the resulting continuous sound developed from the older verbal sense, rather than from a securely established inherited root.
Related word forms
How thrum is actually used
Thrum is literary and somewhat uncommon in contemporary English. It is especially evocative of a low, continuous mechanical sound and may also suggest monotonous speech.