"Par for the course" is what is normal and acceptable for a particular situation. Example: "I get sick every time I travel." Answer: "That's just par for the course." "Par" on a golf "course" is the average number of strokes a golfer needs to get the ball in all the holes; "par for the course" is what is usual and expected. Example: "Things don't always work out as we want in life, and that's just par for the course; we do our best and go on." We should not get too bothered when things happen that are par for the course, because they are regular parts of life.