i found a treasure trove of malaphors and now im thinking about riggs Not Quite But Almost Getting Metaphors and Idioms Correct

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"well burn that bridge when we get to it"
"its not rocket surgery"
"not the sharpest egg in the attic"
"until the cows freeze over"
"youve opened this can of worms, now lie in it"

too many chefs in the pie
I can read him like the back of my book
stand here and talk until the cows turn blue
stick out like a sore throat
like looking for a needle in a hayride
time to swallow the bullet.
easy as falling off a piece of cake
let dead dogs sleep