An average or normal amount; just what one might expect. For example, I missed three questions, but that's par for the course. This term comes from golf, where it refers to the number of strokes needed by an expert golfer to finish the entire course. Its figurative use for other kinds of expectation dates from the second half of the 1900s.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.