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Douglas Harper's Etymology Dictionary
quacker

"a duck," 1846, agent noun from quack (v.).

Wiktionary
quacker

n. 1 One who quacks. 2 (context slang English) A playing card with the rank of two; a duck.

Wikipedia
Quacker

Quacker or Quackers may refer to:

  • Quacker (Tom and Jerry), a cartoon duck character from Tom and Jerry
  • Quacker (sound), a type of unexplained sound detected by Soviet submarine crews during the Cold War
  • Quackers, a brand of duck-shaped cracker manufactured by Nabisco in the 1980s
Quacker (Tom and Jerry)

Usage examples of "quacker".

When the overseer went to check, the quacker was in a crouching position and refused to respond to vocal commands.

A duck maybe, Aly silently countered, pleased yet perturbed that the quacker continued to talk as if nothing had happened.

Moffat flung a horrified look at me over the padded shoulder of her Quacker Factory sweater set.