'Burden' in the Bible

David greeted him, "If you come along with me, you'll be a burden to me.

Just as the king was about to ford the Jordan River, Gera's son Shimei fell down in front of the king and addressed him, "May your majesty not hold me guilty. Don't remember how your servant did wrong the day your majesty the king left Jerusalem. May the king not let it burden his heart,

I'm now 80 years old! I can hardly tell the difference between what tastes good or bad! I can't tell what I eat or drink! I can't hear the voice of men and women when they sing! So why should your servant be an added burden to your majesty the king?