Etymology

pi-jaw

Today it means: Lecturing or patronizing talk, especially from an adult to a child. Full definition →

First used 19th c.
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The story

From pi (“pious, sanctimonious”) + jaw.

First known use, by meaning

  • from 19th c. Lecturing or patronizing talk, especially from an adult to a child.

Etymology from Wiktionary, CC BY-SA 4.0.