1. past tense of thrum; to play a stringed instrument in a monotonous or repetitive way
2. past tense of thrum; to make a continuous rhythmic humming or vibrating sound
3. past tense of thrum; to drum or tap rhythmically with the fingers

Examples

• She thrummed her guitar absentmindedly while thinking.
• The engine thrummed steadily as we drove down the highway.
• He thrummed his fingers on the desk during the meeting.
• The air conditioner thrummed quietly in the background.
• The musician thrummed the same chord over and over.
• Rain thrummed against the window all night.
• She thrummed nervously on the table while waiting.