Willie has handed me several little blows below the belt that I don't like.
We say a person has "hit below the belt" if we think he has done or said something unfair in an argument or quarrel.
The press inspired by Senator Winter had begun to strike below the belt.
It was mean of Rosalind to hit below the belt like that, when she knew that she was safe.
If my hair was as simple a matter as yours—" this hit at his unprotected pate seemed rather a blow below the belt—"there would be no difficulty.