backbiter

Mane (Îngilîzî)

A person who says nasty things about another person behind the second person's back: that is, out of their sight and hearing.

Hevwate

slanderer

vilifier

defamer

traducer

maligner

talebearer

libeler

evil-speaker

gossip

calumniator

Werger

Verleumder

calunniatore

κουτσομπόλης

infamador

maldient

traducteur

diffamateur

mauvaise langue

médisant

médisante

boccaccia

diffamatore

libellista

roddelaar

Wekî (IPA) tê bilêvkirin

/ˈbæk.baɪt.ə(ɹ)/

Etîmolojî (Îngilîzî)

Ji Middle English mîras hatiye girtin: bakbitere

In summary

From Middle English bakbitere, bakbytere, bacbitere, equivalent to backbite + -er.