What does 'Teach your grandmother to suck eggs' mean?

When people say 'don't teach your grandmother to suck eggs', they mean that people shouldn't try to teach someone who has experience or is an expert in that area.

• Category: Food

Idioms similar to 'Teach your grandmother to suck eggs'

• Sure as eggs is eggs
• Put all your eggs in one basket
• All your eggs in one basket
• Fair suck of the sauce bottle
• You can't make an omelette without breaking eggs