Have as an aim or purpose, as in We had planned on going to the movies after dinner.
Anticipate, prepare for, as in We planned on you to make a speech, or They hadn't planned on such a big crowd. [Early 1900s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.