greenhorn

Meaning

Noun

• an inexperienced person; a novice, beginner or newcomer

Origin

• Unconfirmed. Hypotheses include:
• Middle English grene horne, the horn of a newly slaughtered animal
• From the reference to an animal with green (that is, young) horns
• From 17th-century jewellery manufacturing, which used decorated horn impressed at a specific temperature. If heated too high (a common mistake by apprentices), the horn turned green.
• From a misappropriation of the German expression "grün hinter den Ohren" (to be green behind the ears).