Don't teach your grandmother to suck eggs

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Meaning

Don't tell an expert what they know, it's daft.

Origin

From 18th-century Britain, tied to slang; 'suck eggs' for know, by 1700s in a Swift text for nix. A 1740s tale uses it for a jab.

Variants

  • Suck eggs
  • Don't teach

Usage Examples

  • Don't teach your grandmother to suck eggs; she knows!
  • Suck eggs? Don't teach gran.
  • Grandma's fine; don't egg her.

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