Idioms and Phrases with open with
Begin with, as in The concert season opens with the Symphony performing Mahler's Ninth. This idiom uses open in the sense of “begin,” a usage dating from the late 1600s.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.