And that is what it is. It can mean other things but in common usage it means you get what you dish.
It is not a Judeo Christian concept, either. The sun shines on the good and the bad, and the rain falls likewise.
Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap. Galatians 6:7.
Give, and it shall be given unto you; good measure, pressed down, and shaken together, and running over, shall men give into your bosom. For with the same measure that ye mete withal it shall be measured to you again. Luke 6:38
Perhaps you can tell me, using your karma theory, why Christ deserved crucifixion.
He didn't. We did. That is why He took our place.
That’s not karma. It is not compatible with Christianity. Only on Judgment day will justice be meted out. So it’s our collective “karma” that got Christ killed?