Wiktionary
base over apex
adv. (context informal idiomatic English) falling over in a jumbled heap.
Usage examples of "base over apex".
You might have supposed that having so recently seen him knocked base over apex by the Rev.
Jeeves told me you were here, and Aunt Dahlia says you've been knocking the voting public base over apex with your oratory in the Conservative interest.
Again I had that feeling of having been spiritually knocked base over apex.
He told him of his great love for Eileen Stoker, of his father's short way with sons who loved Eileen Stoker, of his ecstasy on learning of Eileen Stoker's impending arrival in London, of his welcome to her when she did arrive and finally of the crushing blow which had befallen him, knocking his new-found happiness base over apex.