"don't teach your grandmother to suck eggs" Ha! Never heard that one before…

"The straw that broke the camel's back" means the final point beyond a person or thing cannot endure. It comes from an old Arab proverb. The first time anybody saw in in English literature was in Charles Dickens's "Dombey and Son", in the 1800's. "Don't teach your Grandmother how to suck eggs" means don't teach somebody something that they certainly already know. "Hey, let me show you how to drive a manual transmission." "Are you kidding. I've been driving one since I was 16. Don't try to teach Grandma how to suck eggs!"

"Don't teach your grandmother to suck eggs." This essentially means: "Do not do stupid things." There is no logical reason to suck on an egg or to suck eggs. Teaching your grandmother to do something silly would make this incredibly stupid. No one uses this phrase much, it's more from the 1990's. It is well understood but outdated.

"the last straw" or "the straw that broke the camel's back" are both English idioms which mean the same thing. Basically, its the last (often minor) disaster in a series of disasters which finally pushes someone to give up on something or for something to fail. So, you can load a camel up with things to carry, but eventually you'll add the smallest thing which will be too much for it to carry. And so its back will break. I think it might be biblical originally. But I'm not sure on that. Example use: "So he cheated on me, then he lied about it and then he had an argument with my dad. But I decided to dump him when he wouldn't pay me back the money he owed me, that was really **the straw that broke the camel's back**."

Hi ! I would like to be your partner for practicing languages :) English, French and Spanish if you want :) I'm native in Spanish. Thanks! :)