'Overthrow' in the Bible

But the commanders of the {Ammonites} said to Hanun their master, "{In your opinion}, [is] David honoring your father because he has sent condolences to you? [Is] it not in order to search the city, to spy it out, and to overthrow it [that] David sent his servants to you?"

Then David said to the messenger, "Thus you shall say to Joab, '{Do not feel badly about this matter}; {now one and then another} the sword will devour. Intensify your attack on the city and overthrow it.'" And he encouraged him.