noun

• (weaponry) A weapon resembling the tool, but typically much larger.
  "The Mallet of arms, according to the representation of it given by Father Daniel, exactly resembles the wooden instrument of that name, now in use, except in the length of the handle, it was like the hammer of arms, to be used with both hands, indeed it differed very little from that weapon in its form."
• (music) A small hammer-like tool used for playing certain musical instruments.
• (games) A light beetle with a long handle used in playing croquet.
  "I had had no opportunity as yet of passing on Poirot’s message to Lawrence. But now, as I strolled out on the lawn, still nursing a grudge against my friend’s high-handedness, I saw Lawrence on the croquet lawn, aimlessly knocking a couple of very ancient balls about, with a still more ancient mallet."
• (sports) The stick used to strike the ball in the sport of polo.
  "I regularly have cause to recall a scene from a novel called Madder Music, by Peter de Vries, in which the main character, a writer who specialises in polo, hears a match announcer telling newcomers to the ground that, contrary to popular belief, the ball is struck with the side of the mallet, rather than the end."

verb

• (transitive) To beat or strike with, or as if with, a mallet.
  "[…] and when a couple of insurgents ran in to make the capture she malleted them with her rifle."

name

• (cryptography) The malicious party in examples of threat scenarios. See Alice and Bob.
  "Even if Alice and Bob's public keys are stored on a datavase, this attack will work. Mallet can intercept Alice's database inquiry, and substitute his own public key for Alice's. He can do the same to Bob."