badmouthing russian

• нагова́ривавший

  slandering, defaming, calumniating, badmouthing

  recording, dictating (audio)

• перемыва́вший

  who was washing all, who had been washing all, who was rewashing

  who was gossiping, who was badmouthing

• перемыва́ющий

  rewashing, washing (all/many things), washing again

  gossiping, slandering, badmouthing

Examples

• Зачем ты чернишь меня перед начальником?

  Why are you badmouthing me to the boss?

• Наговаривавшая на соседку старушка вызвала скандал.

  The old woman who had been badmouthing her neighbor caused a scandal.

• Сосед, оговаривавший нас перед всеми, наконец замолчал.

  The neighbor who had been badmouthing us to everyone finally fell silent.