each ˈother S1 W1 BrE AmE pronoun [not used as the subject of a sentence]
used to show that each of two or more people does something to the other or others ⇨ one another :
Susan and Robert kissed each other passionately.
The girls looked at each other.
They enjoy each other’s company.
⇨ be at each other’s throats at ↑ throat (5)