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(straight) from the horse's mouth

Getting information from the highest authority.

Origin:
When you get a tip for a horse race, the tip is better as nearer it is to the horse e.g. the jockey or the trainer. When you got it straight from the horse's mouth, you have it directly from the source.
This tip is foolproof, I got it (straight) from the horse's mouth!

putting words in the horse's mouth 

interrupting someone by finishing their sentences/words for them
boy, in an argument with his father:

boy: dad, sorry, I'll skip dinner tonight and (...)

father: (...) finish your chemistry and physics projects you are working on? That would be nice.

kodem koll, dad, stop putting words in the horse's mouth, and FYI it's actually Italian and Latin homework I was going to work on, later on the chemistry and physics.

straight from the horse's mouth

i'm telling ya, it's true; straight from the horse's mouth!

(straight) from the horse's mouth

from the most official source(from the fact that a horse's age can be determined most precisely and directly by examining it's teeth)
He gets his stories straight from the horse's mouth.

putting words in the horse's mouth 

the ugly habit of interrupting someone by finishing their sentences/words for them
boy, in an argument with his father:

boy: dad, sorry, but I'll skip dinner tonight and (...)

father: (...) finish your chemistry and physics projects you are working on with your girlfriend Melissa? or go to James's for a juicy?

boy: kodem koll, dad, stop putting words in the horse's mouth, something you've learnt to do so well lately. it's rude. And FYI it's actually Spanish and Latin homework I was going to work on anyways. I'll work on the chemistry and physics later.

I can't go to James's, he out of town for his grandmother's funeral

putting words in the horse's mouth 

the ugly anti-social habit of interrupting someone by finishing their sentences/words for them
boy, in an argument with his father:

boy: dad, sorry, but I'll skip dinner tonight and (...)

father: (...) finish your chemistry and physics projects you are working on with your girlfriend Melissa?

boy: kodem koll, dad, stop putting words in the horse's mouth, something you've learnt to do so well lately. it's rude. And FYI it's actually Spanish and Latin homework I was going to work on anyways. I'll work on the chemistry and physics later.