noun

• (figurative) A spicy taste; a tang.
  "The trailblazing Oaxacan chef Alejandro Ruiz […] has spiked this black-bean sauce with a hidden depth charge of flavor: patches of foliage from a local avocado tree. The leaves electrify the sauce with an unexpected thrum of black licorice."

noun

• (chiefly in the plural) A fringe made of such threads.
• (botany) A threadlike part of a flower; a stamen.
• (botany) A tuft, bundle, or fringe of any threadlike structures, as hairs on a leaf, fibers of a root.
• (anatomy) A bundle of minute blood vessels, a plexus.

verb

• (nautical) To insert short pieces of rope-yarn or spun yarn in.
  "to thrum a piece of canvas, or a mat, thus making a rough or tufted surface"

noun

• (obsolete, slang) A threepenny bit.