Entry Definition
I don't know why; for some unknown reason
(in direct or indirect questions) why
why shouldn't
(conjunct forms only) why, what for, how come
(conjunct forms only) why s/he is eating; why is s/he eating?
(conjunct forms only) why s/he is standing; why is s/he standing?
why not
in order that, so that; (in explanations) why, the reason that, on account of
that's why