each other

each other
each ˈother S1 W1 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)