In Psalm 15:3, the rendering of a word which means to run about tattling, calumniating; in Proverbs 25:23, secret talebearing or slandering; in Romans 1:30 and 2 Corinthians 12:20, evil-speaking, maliciously defaming the absent.

Noah Webster's New International Dictionary of the English Language

1. (v. i.) To wound by clandestine detraction; to censure meanly or spitefully (an absent person); to slander or speak evil of (one absent).

2. (v. i.) To censure or revile the absent.