mat'ter of course'
something that follows in logical, natural, or customary sequence or that is treated as such: After such reprisals, war followed as a matter of course.
Pronunciation: (mat'ur uv kôrs', -kōrs'), [key]
1. occurring or proceeding in or as if in the logical, natural, or customary course of things; expected or inevitable.
2. accepting things as occurring in their natural course, or characterized by an acceptance of things as such: to be matter-of-course in confronting the difficulties of existence.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.