Backbiting dream meaning is explained below using 2 different sources. Each interpretation is shown with its source.

Interpretation 1 — Ibn Seerin

(Belittlement, Defamation, Harm) Backbiting someone in a dream means driving one’s blessings away and nullifying one’s good deeds. Backbiting a poor person in a dream means becoming poor. Backbiting someone concerning a scandal in a dream means that one will become subject to defamation and suffers from a scandal. Like that, whatever subject the backbiting is addressing, its harm will come back to the doer. Belittling someone in a dream means that one will suffer the same in wakefulness.
Source: Islamic Dream Interpretation Author: Ibn Seerin

Interpretation 2 — Joan Seaman - Tom Philbin

1. Family problems.

2. Actions may have potential to hurt others.

Source: New American Dream Dictionary Author: Joan Seaman - Tom Philbin