english
1
general::
see COME IN OUT OF THE RAIN.
American Heritage Idioms
2
general::
Phrase(s): not know enough to come in out of the rain Fig. to be very stupid. • Bob is so stupid he doesn’t know enough to come in out of the rain. • You can’t expect very much from somebody who doesn’t know enough to come in out of the rain.
McGrawhill's American Idioms And Phrasal Verbs