2 Samuel 16:9

Then said Abishai the son of Zeruiah unto the king
A sister's son of his, and a general in the army, who could not bear to hear the king abused in this manner:

why should this dead dog curse my lord the king?
be suffered to do it with impunity; a "dog" he calls him, because of his vileness and baseness, and because of his impudence, and on account of his reproachful and abusive language, aptly signified by the snarling and barking of a dog; and a "dead" dog, as being useless, detestable, and abominable:

let me go over, I pray thee, and take off his head;
go over the plain where David and his men were, to the hill on which Shimei was, and strike off his head with his sword; which he could easily do, and soon put an end to his cursing.