[psychoslave]

In French you would translate solidarité and entre-aide respectively each term, so they worth having each a dedicated word.

Actually I was surprised when I wanted to find a straight forward equivalent to "entre aide". It seems that "interhelp" is sufficiently obvious for having an organization taking this name, but this apparently not an idiomatic word per se.

[082349872349872]

After 5 minutes L1 reflection, my most idiomatic translation for « entre-aide » would be not a word but the phrase "one hand washes the other".