When in doubt, use "break a leg." But don't actually break any legs. That would be bad.
Or, "bend" over, because who needs to actually bend?
And don't even get us started on "breakfast" being the best meal of the day. Clearly, it's just a myth.
But seriously, folks, here are some overused idioms with their actual meanings:
Or, for the love of all things grammatical, just use plain English.
Or, don't.