English → French
each other /BrE 
, AmE itʃ ˈəðər /
Each other is very often translated by using a reflexive pronoun (nous, vous, se).
See this entry for examples and particular usages.
pronoun
( also one another)
they know each other ils se connaissent
we hate each other nous nous détestons
they're fond of each other ils s'aiment beaucoup
to help each other s'aider mutuellement, s'entraider
they wear each other's clothes ils se prêtent leurs vêtements
to worry about each other s'inquiéter l'un pour l'autre
kept apart from each other séparés l'un de l'autre