Definition

1. Noun:
   • A small European freshwater fish: A small, slender fish (Gobio gobio) of the carp family, often used as bait by anglers.
   • A type of coastal fish: Any of various small, spiny-finned fishes (family Eleotridae or Gobiidae) of coastal or brackish waters, typically with a large head and a tapering body, some having ventral fins modified into a sucker.
   • (Archaic/Figurative) A gullible person: A person who is easily fooled or cheated; a dupe.

Examples of Usage

• Noun (Fish):
  • The angler used a live gudgeon as bait to catch a larger predator.
  • Several species of gudgeon can be found in the estuary's brackish waters.
• Noun (Person):
  • The con artist saw the tourist as a perfect gudgeon for his scheme. (This usage is now rare or literary.)

Advanced Usage

• Technical/Mechanical Context: In engineering, "gudgeon" can refer to a pivot or journal, especially the part of a shaft that turns in a bearing. However, this is a distinct, homographic term and not the primary definition of the word as a fish or a gullible person.
  • The gudgeon pin connects the piston to the connecting rod in an engine. (Note: This is a specific compound term, "gudgeon pin".)

Variants and Related Words

• Gudgeon pin (n): (Mechanical Engineering) A British term for the pin connecting a piston to its connecting rod; known as a "wrist pin" or "piston pin" in American English.

Synonyms

• For the fish: baitfish, minnow (though "minnow" is a broader term for many small fish).
• For a gullible person: dupe, fool, sucker, easy mark, pushover.

Related Idioms and Phrases

• To swallow a gudgeon: An old idiom meaning to be easily deceived or to fall for a trick.
  • He swallowed the gudgeon when they promised him instant wealth.

Noun

1. small slender European freshwater fish often used as bait by anglers
2. small spiny-finned fish of coastal or brackish waters having a large head and elongated tapering body having the ventral fins modified as a sucker