noun

• (slang) Someone or something that makes a loud, harsh, grinding or rasping noise, like that of a circular saw.
  "No danger of these buzzsaws waking up, it was enough to make you wish for impaired hearing."
• (slang) The MG 42 general-purpose machine gun.
  "Golden tracers from the jaggering MG42 buzzsaw lit up the air like glitter, and from both directions there were bee-hive-volumes of whizzes and snaps as bullets passed through the air, in some cases only feet from them."
• (slang) A violently destructive attack.
  "The changes ran into a buzzsaw of Congressional criticism."

verb

• (transitive) To cut with a circular saw.
• (intransitive, colloquial) To spin rapidly like the blades of a circular saw.
  "The 7.62 tumblers would buzzsaw through the flimsy protection offered by the float."
• (ambitransitive, colloquial) To produce a loud, harsh noise like that of a circular saw.
  "When the sun comes early through eastern windows and a single horsefly buzzsaws the air it is then I rise from bed my dreams of amputation, of teeth lost, cloaked in the amnesia of another day overwhelmed with trivia."